ideas for books

So the idea here was to have shiro from fate stay night die to lancer's spear and a reincarnator gets to his body before rin gets to heal him. The reincarnator has the boosted gear as a cheat and ddraig notices that his host's heart has been speared right through and decides to replace his host's heart with a dragon one in order to save him. Rin dosen't notice anything, but her attempt at healing mc dosen't actualy do all that much, just healing muscle and skin as the organ she targeted was already healthy

Now, mc's rob let mc decide his 1 wish, but stated it could not be one of the 3 "O"s, not a system and that he had just 20 seconds to decide, and that and rob woulden't tell what world mc would reincarnate to. Mc decided he needed something with great room for growth, so his first idea was rimuru's predator and great sage from tensura, but that was 2 wishes, his second idea was the blacklight virus from prototype, but if mc landed on a magical world there was no telling if the virus would be able to help him grow in that department, in the end, mc decided on the boosted gear because time was runing out. Rob then reincarnates mc in fate stay night. This mc will have no knowlage of fate, and i am quite seriously considering making it an au where sakura has a normal life, the matou having transplanted her magical circuits into shinji but otherwise left her alone (may whoever decided to write sakura's backstory in the og burn in hell!)

Mc will wake up just like og shiro did: alone, in a pool of blood, with strangely no injury. First thing he does is activate his sacred gear and talk to ddraig. Mc will have none of shiro's memories. Mc will ask ddraig if he is ok, as rob would have likely ripped ddraig from his own universe without his consent, mc also asks what year it was for ddraig when he was taken as mc wanted to know the timeline his new partner is from. Ddraig states that he is actuly a copy rob made based on mc's memories, he was programed to be loyal to mc and diden't mind it, but sadly he woulden't be able to teach mc dxd's magic as he had none of the original ddraig's memories, ddraig then explained what happened to mc's heart and that diferently from dxd, mc's new dragon heart was generating mana, ddraig hypothesised that dragons in their new universe were diferent from the ones in dxd and that aparently their hearts supplyed them with mana instead of taking it from the atmosphere through their lungs

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Now i want mc to summon arturia(they will be heart buddies, lol(from my understanding, arturia nof only has a dragon heart, but it is DDRAIG'S lol, talk about a small world)), but i am unsure on how to get mc to shirou's house when mc has none of shirou's memories! Maybe have shirou's house key have the adress writen on it of something? No, that is dumb...

Maybe have ddraig recognize that they are at a school, have mc learn his new name from a tag in the uniforme he is wearing and try to searsh for the director's room to find his own records and adress? And then google said adress on shirou's phone that has no password for some reason? Hmmm... that is a bit convoluted, but better then having ddraig try to track mc's own scent to find his house.

*sigh* maybe i will just have rob pity mc for the 20 seconds to choose the wish thing and give mc the knowlage of how to get to his new home...

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Either way, Mc does not know if the world has magic or not, nor if magic is ment to be kept a secret like in harry potter, so mc decides not to call the police to investigate his own atempted(more like suceded) murder, nor mc decides to stick arround next to a puddle of his own blood as that would raise some serious eyebrows if magic was not widespread, hell, even if magic WAS widespread there was no guarantee that healing magic that powerfull existed, so mc decided to leave the crime scene and (somehow) arrives at his home.

I don't know if i will make mc gain balance breaker on the fight with lancer or not, i will however make mc reveal his amnesia to rin, archer and saber when rin shows up

Rin will believe that mc's new boosted gear and dragon heart are because of the magical pendant she used to attempt to heal mc

Mc's amnesia will be made public, rin will forge some medical papers so mc won't have to pretend to remember his friends at school