wishing you much patience, I also did the switch to unlabelled, ortholinear and colemak DH all in one go about two years ago, and the first month is the hardest. Keep plowing through, you will be fully up to speed in 3 months and start to feel like a witch/wizard after that!
I switch between conventinal qwerty and colemak dh ortholinear on the daily! The different layouts is how I keep them apart :P
15wpm is great for 3 hours! At some point u gotta take the plunge, I used to switch back to qwerty for screensharing since I didn’t want to make anybody watch me struggle to type one word for 10 seconds lol. But the sooner you start at work the sooner you will be comfortable with it. Maybe when you’ve unlocked all the letters on keybr :P
Keep it up, u got this.