Definitely should be available to all players, perhaps just add a GP fee for turning them into the unfinished potions. (the same way tanning dhides takes GP from the money pouch)
While we're showing support for this, how about the NPC at home who decants potion to be fixed so we can decant into (3) dose pots. Majority of pots can be made at (4) but overloads can not, they need be made at (3). So either decanting needs to work or let us make overloads in (4) dose.
Support for this idea.