!DHEDGE
Looks interesting, but couldn't you avoid all the requirements for others to host it themselves, and just change the setup so only one account ever needs to be used for this? Set it up so an account can be called in via comment command like the one above, your bot will create a reply with the beneficiaries set as desired, and the user can just upvote it to reward the content, while you collect your cut every time without worry....
I'm running a little experiment right now with leaving a proxy comment without up-voting with my own bot instance, going to look what it comments on for a day to see if that is a viable use-case.
If this option doesn't turn out, I'm contemplating either what you proposed, or a whitelist or blacklist added to the current experiment.
A nice whitelist option I like to use is whoever the bot account is following. You can have your bot pull following every so often and make a list from that. This will allow you to easily update your whitelist with the click of a button through your favorite front end.