Yes, old nvidia + new linux = pain. A lot of pain.
Man, i wish i could help! However, as i said, it was more than two years ago, when support for old drivers had been provided and when architect had been stable. Architect now has serious issues that make it impossible to run and install system, something with pacman keys etc., generally it ‘hangs’ early.
Look at this thread: Architect iso install story
I will try to do that, but i don’t know if i will succeed 
And i definitely recommend kernel 4.14 if you must try, not newer. EDIT: ah, i see that this kernel has been dropped too. Ok, then maybe 4.19 i will try.