eBay a possibility?
With a link from the support page to an eBay post for free OS for supported devices and make an offer as a donation would cover almost everyone. Even I could do it.
@farmer : if I understand correctly you want a donate page on eBay, right? I am a user and I don't know if what you want is possible, but did you know there are already several ways to donate? Donate page here: https://ubports.com/donate . You can pay through different pay services as well as by bank transfer. If you can, consider donating monthly. But every donation will be welcome.
Yes on eBay as it not only would be easy for me, but also might get UBports a bit more visible to others. Will look at the other options again and perhaps reconsider.