Indeed Stucco. Overcome the IR from NATO is a key point. Slap them in its face is the main chance of success for WP...:)...I do also find the WP inf weak, not sure if this is intended or just my feeling. They need to be used very carefully. Love the Hinds, beautiful beast in real life for me. They used to be more powerful in previous versions of the game, but still a good platform in the recent version. Will pay more attention to the anti-helicopter role, interesting. Cheers!
Here's my 2 cents (OK, pocketful of change) on this:
It's not just about overcoming the Thermal Imagers. There are several factors that come into play that give NATO (in general) a larger standoff range. That's what to pay attention to. You want to have your opening range be 2000 meter or less. Meaning terrain blocks until NATO closes to that range.
In this scenario, the main VP locs you need to defend are well inside Westerbrook (2000m +). So, you are in good shape to run a reverse slope defense. You have a Recce unit with thermals (Recce/283 MRR) and 3 x BRDM units with MGs (rest of that Rgt Recce Co). Get those Recce units position to overwatch the NATO approach, but off expected attack axes so they don't get run over.
Given the amount of trees and built-up areas SW of WESTERBRUECK, I'd try to get the thermal one on the high ground west of WESTERBRUECK and north of the LAUTERSEE lake. I'd have a gun BRDM along with as a replacement of it gets killed. The other 2 I'd put on the high ground just west of BOFFZEN. SA-13s defending each recce group. The east group might get split to cover deadspace/poor visibility areas remaining for the approach to WESTERBRUECK from the southeast. Consider using the tank co as a recce reserve. They are more mobile and survivable than the mech inf.
Set the arty on FSCC and you can do DS with the recce units. Or not. The main thing for using DS in this sort of plan is if you want to weight the fires to one sector or the other. I'd be setting things up so the only folks seeing anything on the approaches would be recce and their supporting MANPADS. Smoke: almost everything the Germans have here has thermals. Except the ATGM sqd in the mech inf plts. Remember to smoke them.
Your fires are limited to one mortar bty for the first 30 min. I think I'd get them as far forward as possible without being seen from outside town. Now, look how far the mortars can shoot and the terrain. You're not likely to see targets on the west side and center owing to built-up areas and woods. So I'd look at pushing the mortars east-ish in WESTERBRUECK. Manage time and space so you pull them back in time, like as soon as the howitzers come online for you.
WP does best when it can create a knife fight in a phone booth. I think you can set that up and have at least some a NATO step into the phone booth missing a tooth or three.