I'd just...
I'd just simplify things down to the basics:
1-kick mic,
1-snare mic,
2-overheads (or under-kit r/l mics),... (total: 4-tracks for drums),...
1-guitar mic, (alt: multi-mics or mic/line blended sound and bussed together down to 1 track),
1-bass mic, (alt: multi-mics or mic/line blended sound and bussed together down to 1 track),
2-mics for vocals onto separate tracks,...
= 8 tracks live down to tape!!!!!!!!
Unless you have 3 singers (Hansen/Jonas Bros), I think that should cut it.
I think for 8-track you have to scale down your ideas of what needs to be separated onto it's own track. If you wanna go back to DAW-land, then you can load all the sounds onto separate tracks that you want, 'til your eyes pop out, but for live work in 8-track analog you have to work within your limits.
F/I, if I were to be so ambitious as you about multi-mic'ing each and every drum, I'd likely mix the overall kit to stereo, with kick and snare remaining separate,... again,... using only 4 tracks for drums. Any other multi-mic'ing of drums, such as top/bottom snare mics or multiple kick mics, I'd also buss sounds together down to their own individual kick/snare tracks.
Same for multiple sources on guitars/bass or other instrumental tracks: buss them together on the front end and record down to 1 track.
This scenario is more mixer-intensive on the front end than track-intensive on the back end.
Sometimes I think people who were trained or raised on DAW recording are a bit spoiled in this regard. (Yes, I said it).
No offense, of course, but DAWs tend to lead you to placing a gazillion sounds down to tracks to do all the mixing work in "post". Free standing analog recording's not like that. I think you're seeing that point in action with this project. However, for stereo panning of guitars and such, this can also be done in "post" with effects loops, if u wanna go that way.
I admire you for hopping into analog wholeheartedly, like you did.
Thanx & good luck, Whoop.
PS: I don't think you're "sacrificing" anything in the above scenario. I do a lot of 8-track work and that's my 2¢, but take this advice with a grain of salt, 'cause I've only been doing this for over 25 years. (Heh).