In theory SRED is supposed to be for R&D. You'd be surprised what can count for R&D. Doing A/B testing to solve the problem of which UI is more preferred/efficient? That can count for SRED work.
You'd be better off creating and Irap project to cover UI and business logic items. IRAP is out of the same government fund but pays slightly less for a project as you go, not one lump at the end of the year.
IRAP and SRED are mutually exclusive but if you spend time thinking about it you'd be able to decide work to fit into both nicely.