OK, so we seem to be talking along two threads here - one is the All-Weather Rüstaz (R-11), which seemed to be a starting point for the 'basic' Wilde Sau operations and then for building a Radar Equiped NF from (eg, A-6/R-11/U2 and A-8/R-11/U2, with various Neptune/FuG2xx installations).
I can see how the H-0/H-1 and C-1 variants (with the All Weather gear on board), could have been employed like the Fw 190A-6 to Fw 190A-8's were, as well as things like the Bf 109G-6 and G-10 (ie: Radar Vectors and GOOD EYESIGHT), which is all well and good... BUT when we start fitting FuG218 and FuG220 (ie, either in the form of the 'spikey' antennae, like the Fw 190A-6/R11/U2 and Bf 109G-6/AS/N, or diapole mounts like the Fw 190A-8/R11/U2 and etc), that gets interesting!
But, a Ta 152 with some manner of Neptune intercept radar, would have been interesting! The Fw 190C series was originally planned to have a shrouded exhaust (on the Jumo213 power plant), so to stretch the concept a bit further, it wouldnt be unreasonable to picture a C-, H- or even E-series a/c with this exhaust and the smaller FuG antennae being used to hunt at night. If as you say, the primary role was as a mosquito-hunter, the C- or E-series makes more sense (in fact, to me, an E-series makes the most sense, assuming the Fw 190C style exhaust was going to be used, as the development on the Jumo 213 engine was already done!)...
Maybe this RV Resin Fw 190C-0/V-20 I have, might have to get short wings and some antennae, plus a Nightfighter type scheme???
Dan