I agree with the OP, even if it's available in the Scholarium it would be nice to get an altar for our houses, the same way we have transmutation stations even though they are also present in the CWC. It would be even nicer to be able to get it with in-game currency, like writ vouchers
i have my main house (grand topal hideaway) listed in the housing tours, it has multiple target dummies, scribing altar, and grandmaster stations (fully filled out with current game), as well as almost every antiquity furnishing on display to preview them
in progress: acquiring mundus stones (currently only have the thief)