Let's say the deal is $100K for 10-20% of pre-revenue/pre-product pre-Mittelstands.
You will get 100+ out of 200 businesses that are >1X+, 20+ that are 10X+, and 2+ that are 100x+.
So I'd do diligence like YC - wide open applications, largely focused on the team, one or two interviews max, global focus.
I very strongly suspect that if investors could be getting returns of '20 that 10x+ and 2+ that are 100x+' as you say, they would already be doing so, and we wouldn't have to be theorizing about it. The fact that VC has for decades only existed for software & pharma and not, like, a new type of cable harness or industrial process or anything else in the physical/manufacturing world should probably tell us something
I dig into the data here: https://neilthanedar.com/we-need-a-middle-class-for-startups...
Mittelstands are allowed to partially or fully exit.
PEs do invest in Mittelstands at $10M+ revenue. But there's not a great market yet for pre-Mittelstands, which is where I'm focusing here.
This seems implausible.