Okay, have dramatically cut out most of what was becoming a very long first post:
1.) Think the Omnia is JUST what I need, as it can do 4G too.
2.) Would like to buy.
3.) Without the aluminium block/heat sink, the modem will fry.
4.) But, no way I could know what size aluminium block to get - as the original seems no longer available. If too big, I don’t have the tools to shave it down.
5.) I therefore cannot risk to buy.