Unless your tokens are worth a huge amount of money, I don't think they will even waste their time in getting back your funds.
With that said, why not try? At this point, you have nothing else to lose by trying:
https://help.coinbase.com/en/contact-usWell it is worth almost 14000$. It is worth a huge amount to me. I will contact them, I just need enough good information that might help me convince them.
By the way, Coinbase is adding new erc20 tokens frequently, is there a chance they might add ETHBULL so i have control over my 'trapped' tokens?
Coinbase doesn't have any chance to add tokens in to their wallet in near future even though they have been talking about this fir very long so all you can do is to contact the support team and convince them as you said. But imo the chances of recovering the amount is less though because they already gave it as warning when you signed up to ther wallet.