AXS Reverb Controller, RHS?

Is there such a thing as a right hand controller? I’ve got a twin lock shifter for front and rear shock control on the left of the bars. On the right is a sram x0 Gripshift. So no room on the left but should be able to fit one on the rhs sram level brake lever (matchmaker), but do they exist? Any other way of doing it?

You can just use a standard right hand AXS gear shifter, and program the button to the seatpost.

I appreciate you’d have an extra button.. but might give you multiple positions to press it from

Oh right, thanks very much for your help!