I heard that recent Godox triggers will work on all recent Godox flashes.  Even across brands.  For example, a X2T-F trigger (which is for Fujifilm  hotshoe mount) can fire a TT685S flash which is for Sony hotshoe mount).

I saw a few onsale on Carousell.

Hmmm… buy and try!  What can go wrong?

… Hours later…

I’ve sort of gotten it to work.  Sort of.  Just a few nagging issues still to solve, hopefully.   Will write a detailed guide once I solved that… so as to deter the next foolhardy person…