Same honestly, I've only used it for one playthrough but it was really nice! It's one I'll have to go back to for sure. :)
Oh boy, I have a lot that I tend to use, it depends on the playthrough but I do have a small stock of player homes I keep for any playthrough occasion!
This part of the list is some of my more favorite player house mods that I've used often.
Leaf Rest SSE by Aukmat/mnikjom Side note about this one, to get the key you may need to TCL into the mailbox.
Cynn's Honeyside Redone by Cynndal
Cynn's Vlindrel Hall by Cynndal
Assassin's Sanctuary by K13RAN64 It's not subtle, but sometimes you just need an edgy manor house.
~Honorable Mentions~
These are my less-used player homes I have but ones I still adore regardless.
Crypt of the Old Guard by ToggleAI
Unique Vampire Dens by Gonkish
The Northern Star Retreat Revised by ArchimageKhan
I have a couple more but this is already a pretty long list, I was also going to add Tel Jerdein but saw you already had it mentioned as well. :)
Flashing Savegames Fix was already mentioned, so instead I'll offer up Main Font Replacement, I use the Magic Cards font and it's one of the mods I always use but always underappreciate.
You also mentioned a music mod, while it doesn't replace the main menu theme and it's not technically a UI mod, I always play with Celtic Music in Skyrim, all tracks are from Adrian von Ziegler I think!
Font Replacer: https://www.nexusmods.com/skyrimspecialedition/mods/14356 Celtic Music in Skyrim: https://www.nexusmods.com/skyrimspecialedition/mods/2980
FINALLY! My immersion is sated!
My favorite one was the immersive anxiety mod.
Well first off, I'm gonna miss my favorite nerdy subreddits. r/wow, r/Morrowind, r/Oblivion, r/Skyrim, r/Elderscrolls, and even r/trueSTL. Happy that Skyrimmods is here though!
Aside from that though, r/botchedsurgeries, r/amitheasshole, and r/hobbydrama.
The rest would be various animal subs, but hopefully, they find new homes quickly.
I had sort of the same problem when modding my summoner/sorcerer playthrough a while back, a lot of Necromancy stuff but not as much for the Daedric side of things. Now I love me some Necromancy, but it was a little frustrating not being able to find as much love for Daedra.
Someone else could probably recommend better as my recommendations here primarily come down to spell mods, but you mentioned a scholarly interest so something I can recommend is the Spell Research mod. I can't remember much about it as I haven't played with it enabled for a while, but it adds something extra rather than just getting spell tomes the normal way.
You already mentioned Mihails mods but I did the same, just added as many Daedra as I possibly could.
Not really Daedric-themed but this one adds more immersion to the College of Winterhold and lets you do quests for every school of magic, College of Winterhold Quest Expansion.
I might be able to recommend some house mods but the ones I used on my summoner playthrough were Dunmer-themed, and I think I just ended up using JK's College of Winterhold at the end of it.
Spell Research: https://www.nexusmods.com/skyrimspecialedition/mods/20983
College of Winterhold Quest Expansion: https://www.nexusmods.com/skyrimspecialedition/mods/66666
JK's College of Winterhold: https://www.nexusmods.com/skyrimspecialedition/mods/65676
Edit OH I also forgot, just for the scholarly side of things there's The Eloquent Reader, gives you some speech experience for reading books. https://www.nexusmods.com/skyrimspecialedition/mods/16338
Thanks for giving her a go! I'm very passionate about Skyrim modding so I'm happy I get to lend my voice to something like this, as well as help on the writing side when needed. :)