You can donate money to the Ukrainian military. It's not very convenient (no PayPal etc.) but the military is accepting foreign donations via wire transfers.
https://ukraine.ua/news/support-the-armed-forces-of-ukraine/
https://ukraine.ua/news/support-the-armed-forces-of-ukraine/
If you want to donate I would try to find some small scale relief effort that probably has no free Central bank money raining over it.
Given the success of Turkish drones against older Russian weaponry during the recent conflict in Artsakh, maybe the Turks could be convinced to test the drones against more modern versions? Although your point is correct, that the time to have arranged this has passed.
https://bank.gov.ua/en/news/all/natsionalniy-bank-vidkriv-sp...