Is there any update on the progress of Eypo :D im really excited to use this app haha.
FYI Grip from ABN now also supports bunq, however they request full access API key which is overkill. The app itself however works and looks fine. But only they dont support joint accounts.
They also seem to have transfers under control and does not clutter your budgeting.
Also, is there a reason you do not let the app itself make the API calls ? This would partially solve your rate limit issues. Which makes it even better at a privacy point of view. As you can make the OAuth api key wildcard, if I'm not mistaken.