You have found the only way for an Artificer to restore the Metamagic Adept SP apart from a long rest.
A 14th level Artificer has the Magic Item Savant feature:
You ignore all class, race, spell, and level requirements on attuning to or using a magic item.
So a 14th level Artificer may attune to the Bloodwell Vial, which says:
In addition, when you roll any Hit Dice to recover hit points while you are carrying the vial, you can regain 5 sorcery points.
Since you maximum SP is 2, you would only regain 2.
There is no other way to regain these 2 sorcery points, except through taking a long rest. As noted in my answer here, Metamagic Adept does not allow you to convert spell slots into SP.
This search on DNDBeyond shows all of the relevant results in their database that mention the phrase “sorcery points”. The only results are the Metamagic Adept feat, the Bloodwell Vial, and the Sorcerer class.
You can restore them a little bit quicker if you are a race that can long rest in 4 hours.
(Notably, a 13th level thief rogue could probably do something similar with their Use Magic Device feature.)