I'm not sure if degiro actually allow adding a dollar account for payout; IIRC they require payout to be to the original funding account. One possible option might be to transfer the shares to, say, IBKR, which I believe has cheap FX, and sell there, but there are a lot of moving parts there and transferring shares may incur fees on both ends.
If it's a very large amount, it might also be worth asking degiro if they'd be willing to come down on their FX margin. No idea what degiro's policy is there, but Irish banks are willing to negotiate on fees for FX of amounts in the 100k or more range.
EDIT: However, just looked at degiro's website. "The fee for Manual FX is €10 + 0.25%." That may be cheaper than Wise; iirc they don't really get down below 0.3% til you're FXing multiple millions.