I'm with dontpressthat.
There's no point doing an IMC if you're going to do an IR. Bear in mind also, that a single engine IR is not transferable across to a Multi engine IR, so you'd have to go thru it all again, all at an extra and unnecessary cost.
The IMC is a lot cheaper than an IR. I had an IMC prior to getting a multi engine IR, but there was a 6 year gap between the two ratings. It certainly helped, but I wouldn't spend the money on two ratings if I could help it.