Conundrum

Okay folks, I have a bit of a problem.
I've gotten some more Heroics and Ros 6mm figures.  This time it's their modern US, that I plan to use for my 6mm vietnam project.  That's all well and good, but I need some opponents for them.
H&R don't make any VC figures.  I could try to convert their Warsaw Pact range, but that's likely to be a fair bit of work.
As far as I can tell, there are a few manufacturers who make VC and NVA in this scale:

• Mainforce - too big
• GHQ - too big and too expensive
• Irregular - my usual choice, but big against the H&R.

Below is a comparison shot between H&R US infantry and some Irregular VC.  I've lifted the H&R to account for the base on the VC, and they aren't too bad:



The problem really arises with the comparison against the NVA (really Main Force VC for the most part) range from Irregular:

Not as close....
Every time I look at the second picture, my response ranges from "That's not too bad..." to "that's awful".
My budget appears to have backed me into a corner on this.