I wish you haven't lost that bet :(
(Though, I completely forgot about it)
I would suggest to donate via "Demokratychna Sokyra", they used to be a wannabe political organization, but since the start of the war they have been operating as a volunteer organization supporting Ukrainian Armed forces. Here's a page describing their current projects: https://sokyra.space/en
They have bank transfer mechanism, but for people like ourselves they have a PayPal: donate@sokyra.space

If you don't like this option for whatever reason, let me know, I'll think of a different one