Its something like that or could be more.
I have the same problem with MEP time and CRI etc.
I Have been flying twin engine manual (ie no AP) TP's for years have 1000's of hours on them.
I had an unrestricted FI rating as well.
My MEP is out since I started flying TP's.
Similar to most FI's who went to airlines I have about 50 hours twin time but none of it PIC.
To be able to become a CRI on MEP which is required to be an instrument instructor on them I would have to build 30 hours PIC time on MEP which is over 10 grand. So for anyone wanting to go down your route its getting on for 20k in ratings and hour building for a commercial pilot with over 5000 hours commercial flying.
For a FI who has come to the conclusion that they will never fly airlines or it just doesn't interest them your talking 40k for building 110-150 (depends on how many hours you can claim with your IR training) hours in a IFR single, 30 hours in a twin (IFR and PIC), CRI MEP, IRI. If you don't already have a FI that's another 7k. You would be virtually unemployable if you just tried to go straight to IRI, CRI MEP without commercial experience just by hour building.