There is an enchanter to the far west of Lovis' tower and then north a bit. If you are careful you could probably get there at level 9, though you would want to stay north of the river and avoid the entrance north towards Maxos temple (level 11 black ring members can be taken alone or in pairs at level 9, but more than that required a fair bit of strategic withdrawal or potion use).
Any formulas you bring to the enchanter or alchemist in Broken Valley will be carried over once you get the battle tower.
