Whilst it may seem inelegant, why not just do the CRI course and skill test?
With the teaching and learning component not required, and assuming you're as experienced and current instructor as you sound to be - it should be 4ish hours flying over 3 days, and a skill test on the 4th.
No, not as cheap as I'm sure you'd like, but not horrendous either.
Incidentally, of anybody who has done both FI(R) and CRI, how different are the two skill tests? I've only done the latter and although I'm sure I'll get around to FI at some point, I'd be interested to know what the real differences are at the skill test point in the meantime.
G