I love those ideas, HollownessDevour ! What fun! I can see that blending well with the royal pack, though I have done a blended experience with the royal pack in my game, as that is what appealed to me. I basically started with my Hyrule Castle lot which I made to be playable off-the-grid (though I'm not currently playing it that way). It's full of stone everywhere and has a blend of a modern and old-world castle feel, as do the sims I have running it. King Rhoam worked his way up to king, though he did so without taking down others. Link pulled the Master Sword from the stone but will never use that fact to take the throne from him as his devout knight.
Then on the other side of the map I blended my legacy sims, their alien-abduction daughter, and one of my supersims into the Monty bloodline through Dante marrying one, then the other after the first wife passed. This household lives in a modern mansion I made with those types of aspects from the pack, and likewise no one has been 'overthrown', yet both households have produced heirs who am thinking may partially inter-marry to make the dynasty/royal families thing even more interesting, and likely peacefully as possible since that is my way in Sims. So, I have had a lot of fun exploring some of the more rustic options and modern options of the packs and world at the same time. I must say, I have had a lot of fun doing so. And my butlers, whom I don't have to pay per 'free services' perks, definitely earn their not-pay! 😁
All that to say there are so many ways you can play things out and get creative! I hope you're having fun as things are now in regards to these types of options, and if they add some of the features you mentioned in your post I think you and I would be enjoying many more ways to mix things up in our game. Thanks for sharing your ideas!