I would say that assuming a separate German supplement set is coming, having a couple of infantry sculpts might be better than heavy artillery… and maybe 3 infantry options would be better than SP artillery, ESPECIALLY because you’ll already have the StuG III to use as SP artillery, which was, indeed, somewhat closer to its original intended role. (Interestingly, I recently discovered that StuG III’s were mostly manned crews from the “Artillery” branch, whereas the TD’s, like most of the other AFV’s were manned by the Armor branch soldiers.) Aside from a few StuG’s, Most axis minor SP artillery (such as there was) was pretty ad hoc stuff; converted hulls of one thing mated to a completely un-related gun over here often even combining German and captured Soviet parts…! Infantry is what the axis minors mainly had… for AFV’s they pretty much made do with whatever they could get.
The dilemma (and I’m sure you’ve already been struggling with it) is that infantry uniforms are often where the national distinctives come out most. Fortunately in the case of the axis minors, the widespread use of the German Stahlhelm and derivatives is likely to hide a lot of this on this scale, perhaps for all but the Romanians (whose helmets were actually based on the Dutch model, of all things!) It almost makes one wish you could do infantry and vehicles as separate categories: if you did do infantry with the Romanian helmet, if you went ahead and did some more in orange, you’d have the perfect Dutch infantry, but then you’d maybe want another vehicle set for the Dutch (one that includes some warships up to maybe cruiser size, certainly…)
I always thought those Dutch-Romanian helmets were pretty cool-looking and distinctive, if a little “villainous” (perhaps because they sub-consciously reminded me of those worn by “COBRA” soldiers in the “GI JOE” universe of my childhood)…
But I digress. For the best possible applicability for axis minors, (setting issues of dual use as Germans or Dutch aside) I’d prioritize as follows:
1. Stahlhelm infantry
2. Field cap infantry
3. Romanian helmet Infantry
As to whether to put them in long coats or winter gear, I’m not sure yet. I just ordered a book on Germany’s East Front allies, so I’ll report back my thoughts on that as soon as it arrives if it isn’t too late by then…it’s so hard to find good info about these armies on the web! (Unless I’m missing something…)