Galeforce/Luna/Vantage/Limit Break/Armsthrift is my usual staple set for Chrom!Inigo. And really, most of the cast who can get it.
As a general rule, I swap in procs for procs. RFK's kind of hard to fit in, but I usually only put it in for stuff like Astra or Lethality if I want to fool around a bit. You can drop Armsthrift for it if you've done enough regalia farming.