It seems odd the slider and button both use the same CC message to broadcast their values on.
This is something Renoise can’t really filter. Duplex can however, because in Duplex you can set minimum and maximum values for each defined controller range.
I think you might be better off building a duplex template for your device. May be a bit of work, but once done, you are set for every new project to go (and if you share your controller template, you could save someone else the same hassle).