Do the RDL first!
Well, actually, do your windscreen first, then seat, then handlebars(Helibars).
THEN, look at other controls.
I'd hate for you to get the perfect seat and only then discover that the HT shifter is now 'uncomfortable.'
If you have the seat, then buy the shifter, if it "doesn't work out" - you can return it.
Just a little logistics thought processing after my coffee,
Cheers,
Steve