Well, here's something you could try if you have (or open) a WriteforMe account.
It will substitute some regular spanks for PINK BELLY slaps - so it makes life easier for your red red bottom, at the cost of making your belly pink or red with your hand or a ruler (yikes!).
Count the slaps on your belly, both from the interruption messages and at the end.
For every slap or smack you get 3 reduced from your spank bank. So do this task itself first, then pick one of the other tasks from the links in the reward message at the end and slap on to more reductions.
https://writeforme.org/task/5ec90215962f93108ae32c65
EDIT: it seems the OP has not been on the thread for a while, so it may be effectively closed. ???