Not sure if I understood this right, but house crafting progression is character-bound and not lost when leaving a house, so if you leave your separate houses and put the characters with respective house crafting progress into your main house as Captains, you will be able to access your progressions =)
I've done the same with my separate Defender and Support houses after the update.
I've done the same with my separate Defender and Support houses after the update.
Yeah, I looted stuff alright, go away!