First thought is "Why"...

I have brief experience of a Pletty/Rasa 21x15 set-up in a Leviosa,by recommendation as the nearest(NB not the same) in performance to the fairly commonly-used APCE 21x14/20.5X14.
The Rasa is smooth,quiet,OK in calm weather,but a little slow for the usual breezy UK weather....and it needs about 1/2 as much again ,dialling into the braking program on the ESC, to get the same downline brake as the APC.
From 4-blade (fixed) experience with IC pattern motors,I'd guess that braking would be improved quite a lot cf 2 blades....but with the loss of efficiency, you might struggle to get enough vertical performance,and/or outright speed,especially round the top corners of manouevres into a headwind.....