OK, so I've looked into this a little more.

Apparently the X2 Trangia multifuel burner is a combination of the Primus Omnifuel and the Primus Multfuel EX. The performance has been backed off a bit in an effort to preclude the melting of the windscreens. I've read that the larger Trangia 25 will be a little more resistant to melting than the more compact Trangia 27. Seems even weirder that if there's a potential windscreen melting problem that they'd remove the fine tuning valve at the burner, the very valve that could be used to moderate the flame and prevent potential melting.

That being said, I've seen several posts on the net where people adapted a stock Primus Omnifuel for use in a Trangia set up, so it's clearly possible, but isn't completely straight forward. The adapter and the windscreen will both need some modifications.

Sounds to me that if you have an older Optimus Nova (before Katadyn bought out Optimus and messed things up), that might be a better option for use with a Trangia set up. Trangia had used the Nova burner for a number of years. When Optimus was bought out, moved production to China, and started having serious quality control issues, Trangia switched over to the X2 burner from Primus. I can't say for sure that the switch was due to the quality control issues, but the timing sure makes it looks as though that were the reason.

HJ