Paying ever more karma to do so that could easily acquire the qualities one wants, or actual metamagics.
Besides, it says
Must be an Adept and have Unarmed Combat 6
and
Gain Barehanded Adept for free (magicians resist drain normally).
Nowhere does it say that non-adepts can pick up that quality, we only infer that because it explicitly mentions a rule that would make no sense if it wasn't so. Why would I, then, assume that part of the requirements is waived, while the other half is not?
Given that, say, westphalian theurgists get an extra mention that they need to have the skills to use Vexcraft's bonuses, I lean towards assuming that "gaining X for free" means the character just gets it, all dependencies dropped, unless otherwise mentioned. After all, "you have to pay 10 Karma" is sort of a requirement as well.
There is no definitive proof of either assumption, so everyone might have to go by what makes the most sense to them.