We don't generally use BIPs for random UI things.

As far as the idea goes— perhaps. Though I'd recommend adjusting your business plans such that the average of the fees in total is what you worry about; rather than the fees on any particular transaction. Otherwise you're just going to get jammed up and unable to transact when someone has sent you a number of dust inputs and the only way to eliminate them is to pay a somewhat high fee... all your low value transactions will end up failing until you up that limit.