That's a lot of dicking around with chain length! Not to mention its line....
No chainline problem at all, the hub is designed to simply turn over and the fixed aligns to approximately the centre of the block. Only us old gits remember things like that.
It is not necessary to strip all the gearing off just to experience fixed, simply shorten the chain. Scruffy, I agree. That's what I did when I smashed a gear mech in the 1970s, turn the wheel over, shorten the chain, leave geary bits where they are.