Hi Jet Ranger,
I indeed saw the text in EASA FCL :
"7. A single-engine IR(H) course shall comprise at least 50 hours instrument time under instruction, of which:
...
8. A multi-engine IR(H) course shall comprise at least 55 hours instrument time under instruction of which;
..."
But for the extension for SE to ME I only found a section with regards to instructor privileges :
"FCL.905.TRI TRI — Privileges and conditions
The privileges of a TRI are to instruct for:
...
3) the extension of the single-engine IR(H) to multi-engine IR(H);"
You mentioned a 'prediction' on this extension, would you have any sources on this ?