Capital Windhelm and Simplicity of Snow Compatibility

I'm one of those people who swore to myself that I would never download a mod that overhauled the interior of a walled city in Skyrim. It'll be a compatibility nightmare, I said. It'll mean I have to rearrange my whole load order, I said. The patch support will be rough, I said.

I was RIGHT about 100% of those things but it didn't matter because I really like Capital Windhelm Expansion. I tried it out and couldn't live without it. Unfortunately I noticed that it caused a CTD if patched for Better Dynamic Snow 2. 11 and looked weird if it didn't. Okay... there was a fix for that, which was updating to BDS 3. 0, which means no multipass shaders or something too complicated for me to understand. Okay I'll just go and disable all the parallax meshes I literally just downloaded, that's cool, I'll live, this mod is beautiful and honestly I'm glad BDS 3. 0 lets us have beautiful snow without patches now. It's fine... it's fine... honestly it's more than fine, my game looks great and I don't miss parallax very much. I play happily for oh, a month.

Then I accidentally deleted my SSE installation and all my mods :) so the release of Simplicity of Snow (lol) as I'm still rebuilding my load order was well timed. I instantly clicked download the same as y'all did. I liked the results and I definitely liked the sound of being able to use those paralllax meshes again. I'm running through snowy regions and things are looking pretty good until... CTD entering Windhelm.

Through tears, I check NetScriptFramework\Crash:

Possible relevant objects (11)

[ 0] BGSMaterialObject(FormId: 0002871B, File: `Simplicity of Snow.esp <- MajesticMountains.esp <- Update.esm <- Skyrim.esm`)

[ 0] NiNode(Name: `Scene Root`)

[ 1] TESObjectSTAT(FormId: 2C120113, File: `WindhelmSSE.esp`)

[ 7] TESObjectREFR(FormId: 2C0FC3E5, File: `WindhelmSSE.esp`, BaseForm: TESObjectSTAT(FormId: 2C120113, File: `WindhelmSSE.esp`))

[ 17] BSFadeNode(Name: `WHprisonwallcap01`)

[ 18] BSFadeNode(Name: `Campfire01LandOff`)

[ 152] hkpRigidBody(Node: `NiNode(Name: `ArenaDoor`)`)

[ 196] hkpRigidBody(Node: `BSFadeNode(Name: `IcicleThinStrip`, Owner: `TESObjectREFR(FormId: 2C12FCFE, File: `WindhelmSSE.esp`, BaseForm: TESObjectSTAT(FormId: 000F7F4F, File: `Skysan_Icicle.esp <- Skyrim.esm`))`)`)

[ 264] BSFadeNode(Name: `Scene Root`, Owner: `TESObjectREFR(FormId: 2C12E65E, File: `WindhelmSSE.esp`, BaseForm: TESObjectSTAT(FormId: 2C129482, File: `WindhelmSSE.esp`))`)

[ 276] TESObjectSTAT(FormId: 2C129482, File: `WindhelmSSE.esp`)

[ 276] TESObjectREFR(FormId: 2C12E65E, File: `WindhelmSSE.esp`, BaseForm: TESObjectSTAT(FormId: 2C129482, File: `WindhelmSSE.esp`))

Okay so it's some snow shader, being applied to some static. I go in and patch the shader ou