Putting omnifuel inside is an interesting thought. Wasn't there an legless version made for putting inside trangia, or did I confuse some other stove with it?
I'm not 100% sure about this, but from the photos I've seen, the multifuel burner now sold for the Trangia
is (basically) an Omnifuel without the legs. There's a sort of "adapter" to hold it in place in the Trangia, but I think you could rig something up. Omnifuel + Trangia = NICE.

HJ