I think OP tries to stay with Betfair because Betfair has the largest sport exchange market.
Most of the crypto casinos don't offer exchange services.
One of the reason Betfair and other UK based sportsbooks are not offering crypto deposit/withdraw is because UKGC has a tight regulation on AML.
There have been some casinos tried to do that but actually got sanction in the end, so I don't think Betfair will add crypto anytime soon unless there's a huge change on the circumstance.

Betfair excludes customers by country of residence, not country of citizen.
Which means, if you're a citizen of one of the excluded countries, you're still allowed to use your ID to open an account if you're reside in another country which is not excluded.
So some people will choose to use VPN to bypass the restriction, but you must choose a VPN that's not blacklisted yet.
Betfair has blacklisted most of the mainstream VPNs, even if you're able to open an account, it will be closed very soon.
Betfair has been very difficult to play with since they joined Stars group, they have and is closing lots of accounts and there are lots of complaints against them.