Bryan looks like you have a handle on thing at this point. Little tangent here. I have not sen this Rode/Rycote collab discussed here, but ended up buying one a little while back to hold sole line audio/cm3's in the new style SRS mount. It's a lot like the SRS center mount, but it has more options for spacing and a strain relief. It's actually centered like the SRS base too, if you disregard the strain relief, which is pretty handy sometimes. It's also cheaper than any combination of everything else, ships fast, and is returnable if need be....
https://www.amazon.com/gp/product/B01LS9J7R8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1