Thorn Bird
I sat down at the pub today with a printout of the Part 61 Contents pages and my laptop, ordered a burger and a beer, and started poking about. I recommend the alcohol, it cushions the impact.
It took me 5 minutes to answer every question on this thread and it aint all that bad.
Thorn Bird, roundly speaking your single-pilot piston twins can all be covered in a MECIR renewal in that CLASS (ie: ME Fixed Wing).
Your multi-crew types should be covered by your CAR 217 checks.
If you have an ATPL but you work outside a CAR 217 org, your IFR renewals are under the same rules as now.