Wait. If they accept your ETH signed message, you will get your account back. If not, then there is nothing you can do.
Stop giving them false hopes lol There are several accounts which have provided signed messages from a bitcoin address and they're months into recovering their accounts without any luck. I doubt admins will have time to verify ETH signed message.
What OP can do is, provide signed message to a DT member and get that account flagged until it is recovered (which is unlikely to happen tbh)