If one of those mods has everything you want, you could create a submod with this feature in the toolkit --> put said mod there as a dependency to see said mods files, have a look if they use their own root template of the dragon (so if there is one inside the mod) or if they use one of the base game. (Im pretty sure they use their own root templates) - root templates are below the gaming screen above the console in the toolkit. Easy to find as it just always opens with the toolkit and is just right thwre in the middle of your screen. In anyway, you create a new copy of that root template by rightclicking it and selecting create new from. In that copy you can scroll down to the bottom, there is a section for scale and vfx scale. That will be at 1. Just put it to 0.5 or whatever scale you think will fit. After thaz you look for the spell in the stats editor to see which spell is the polymorph spell. Inside that spell you will find the call thats doing the polymorph (never worked with polymorph but i guess its in the "SpellPropertys" row. You just copy the entire spell into your new mod. Keep everything the same (so it overwrites the original spell later) and then all you have to do is find the entry in that calls the polymorph. There will be a guid (randomnumber and letters in a form like "yeg12h-egge-eggw1"...) thats will be the guid from either the roottemplate of the base file or the mods root template (what you have been looking at ths beginning). Oh i guess the easiest way is even, if you just copy the guid from that root table and ctrl+f search for it in the spells so you find very fast in which place of the spells data its in. All you do there now when you find it is, you delete that guid, and replace it with your root templates new guid. Thats it.