Seriously, we could just replicate this room type by setting those two items for one of the shop types and set that value for the take one item room type.
Here's an example of how I replicated the Red Potion or Heart Container Room type with a Take One Item Room Type with a shop value containing the red potion and heart container:
Of course, if the Red Potion or Heart Container Room type were to be removed for this reason, then the developers would have to apply a compatibility fix to any quest that was made before the Take One Item Room type even existed.
I can certainly see the redundancy, but it doesn't really appear to be doing anyone any harm. It is, in a sense, simply a more obvious form of the "Take any item" room. But do as you'd like.
It could possibly be done. We could set it to find the first available shop, fill in the relevant data, and change all of the HC/Potion rooms to Take One rooms and use that new shop.
There is, of course, the sordid possibility that there are no available shops...
Can't you keep going back into the shop and keep getting the items, but only get the 'take one' item once?
The Take One Item room uses a shop to determine what items you can only take one of.
Oh.
Shows how much I use that feature.