I think we need to try to make some deal here and start using something that already exists and it is well established. If we find such service, make a thread where webmasters willing to accept will leave their confirmation, then the thread can be sent to sponsors and we can demand that they support all that.
For example,
https://epayservices.com/ , anyone using them? I never had a chance to try, or ther was no real need until now.