In 8 years working full-time with Discourse I have had maybe 2 customers that wanted to pay with cryptocurrency. I guess you have a very different customer base. I suspect for the bulk of Discourse Enterprise customers, it’s less than that. For the most part, Enterprise customers drive development of new features.
And if you want to support BTCPay or whatever, you can develop or fund your own plugin. BTCPay doesn’t support a Ruby library, and the Bitpay ruby client they link to seems to have been abandoned (it’s been marked read-only). That’s going to make developing and maintaining a BTCPay plugin for Discourse complicated.