hm, no, if anything it sounds like you might want some gain between zoia and norns-shield. (if zoia is intended to drive a guitar amp.) norns-shield has unbalanced stereo I/O and expects line level signals (around 0dBu peak.) the shield is a little noisier than the enclosed version so it is good to give it close to full range.
reamp, i doubt that’s necessary, it does look like the -12db pad on zoia is intended for taking line level signals.
if you were to use a DI, it would be 2 channels between norns output and your interface. this could clean up some noise if you are running into mic preamp channels on your interface.
on a different note, i guess… i’d personally think hard before concluding that three separate stages of computer processing are really necessary. if they are, then it’s definitely gonna be easiest to avoid clipping and noise if you have some appropriate analog mixing setup. (in this case, something like a pair of FX loops with volume controls on send and return.)