Very well said C421.
For Fuji, BEagle, FREDACheck and all of the other passionate IMCr holders. Jawboning about a group that is looking at European solutions and has a TOR which any objective reader would agree does not include 'Ensure there is no compromise of existing IMCr holder privileges) is a sterile exercise. Waiting for an output from this group (which is a multi year process as David pointed out) is just letting opportunities slip.
Your time would be much better spent working effectively with the CAA to ensure you and they have solid legal and political opinion about which of
1. grandfather rights for existing IMCr holders to continue with their privileges indefinately, at best, or for a multi-year transition period
2. transition credits towards the full EASA IR
3. UK-only "extension" of IMCr approach privileges to the EIR
is the best stand for the UK and CAA to choose to save the UK IMCr.
I believe the UK AOPA is engaged in this. I assume you are all members, so get involved with a proactive solution - because no European focused process is going to come up with a solution that is 'UK gets to keep IMCr!'