The main issue would be balance concerns with constructing the object.
For example. If pylons heal in the general vicinity, they'd prolly need a substantial production cost cause that's a pretty huge buff for the cult. Maybe something like 200 glass, 15 unprocessed silver ore, a Soul Shard, maybe sacrifice something living (a monkey?), and maybe a Construct Rune that functions as a regent rune. Said Construct Rune with different sets of inputs could be used to make the forge, desk, and alter perhaps as well. Hell, it would give a way for the cult to make cultwalls besides having an Artificer. 10 metal and one unprocessed iron ore maybe?