Ah but, VNE/GS, all of the operators that you have mentioned operate 300s in addition to R22s. As a CFI, would you be interested in an FI(R) who could only fly (or potentially fly) one particular type that you operate, or all types that you operate?
If you are limiting yourself to 300s, miket_68, then your only realistic employer might be in the US - HAI/Bristow. But even then, I wouldn't put all of my eggs in one basket. Because it's a bugger if that basket breaks!
Edited to add: I've just re-read my post and, in hindsight, AH Helicopters obviously don't operate Robinsons. But are they in need of an FI(R) right now?