What’s your plan for tensioning the chain?
The Phil Wood eccentric bottom bracket looks like the most bulletproof choice, but when I add up the $250 for the bottom bracket plus the $85 tool it makes a cheap frame kinda expensive

There is a similar product for about half the price, I don't know if you have any opinions on this?
https://www.firstcomponents.com/bottom-brackets/eccentric/p237sa/ . It does look like the design has a higher risk of the set screws slipping , or stripping of the threads, but I'm no expert. The technical drawing also shows it accepts a spindle diameter of 22/24mm, which I think is GXP, and I'm not sure there's a boost option.
My other option would be a chain tensioner where a rear derailleur might go.
I tend to run either a 32x19 or a 32 x 20, a few times a year I'll race in a bigger gear if the terrain is mostly flat. How time consuming is it to change tension with the Phil Wood EBB?