Advice Needed - Qs On 2018 R - Which P/n?

hi folks,

I'm thinking about adding a QS to my Speedy but am a little confused about the part number that should be fitted to get me up & down Qshifting. I can get my hands on a brand new cheap A9778550, but

A) I'm not sure if it's compatible (Triumph website quotes A9770425, which is compatible with the S - R is not on the dropdown on Triumphs website). Has it been updated? I read quite a bit about some QS being only up and some up/down shifters so am not sure what the 550 p/n would get me.

So to save me a call (and potentially getting a bum-steer) can someone advise if the 550 is compatible? the box says its suitable for 2018 S, which from what I know, do not differ hardware-wise to the R.

B) the risk involved in buying a non-distributor supplied part & fitting it myself - if it really goes wrong, I'll be stuffed with no minimal cover and a gearbox to replace ....Even if I get it from the distributor, the note on the box (that I've seen) still says it needs to be fitted by a qualified technician)

Is it all worth it? I'd say 60% of time, I do ride rather "dynamically"