Acceptable Clones? Perhaps passed through Gordon?

that project to support the P8

the p8 is long gone, out of sales. The same goes for most of the nrf hackable watches, very few exist nowdays, you are 3-4 years too late.

you are also missing an important point. Espruino is funded by hardware sales. It makes no sense trying to bypass the means of funding. At the end, if one succeeds in porting to a cheap alternative, he will only harm the project. I think this is mostly the reason that very few people will be willing to offer what you ask for. If you want to put some effort, espruino is ready for some 4-5 watches, if not, the bangle.js2 is fine as is.