Tax implications of any possible Ethereum fork.

Hi, I have some Ethereum on a hardware wallet that was UNFORTUNATELY purchased on Coinbase with its KYC. The IRS already has ruled that forks and airdrops are classified as income meaning I would be charged tax for the value of the fork on the day I received it. This is a confusing cluster for me. I haven't been through this before. I might have to sell the fork on the first day just to be rid of it and put aside a portion for taxes but I don't even know if coinbase would let me send ETH back to them to somehow sell the fork which they probably won't support. Any good advice is appreciated. Thank you.