I spend 95%+ of my music-making time playing, experimenting, etc, and only a tiny part mixing. I much prefer speakers for all of it, to the extent that I rarely make music if I have to use headphones.
What I’m saying is that, unless you are professionally mixing a lot of the time, you might not need all that room treatment. Just curtains, a rug, and as much soft stuff as you can fit in the place.
Use headphones to mix, perhaps, or just listen to your mixes on airpods, kitchen and car speakers etc to learn how your mixes translate.
Terrible advice I know, but not all of us need fully treated rooms.