You should avoid just swallowing the plain shards/crystals/powder because even pure methamphetamine is somewhat caustic.
Indeed capsules are a viable option for your 'MOA'.
Imo and in my experience oral administration of meth is the best way to consume methamphetamine.
Way smoother, by far less morish, longer lasting plateau effects; the list goes on.
Personally I prefer to put 20mg to 30mg of clean meth in a capsule, once a day, orally.