Using UV-C (254nm) light to cleave the amino acid off of vyvanse
Honestly, I wouldn't bet on a cleavage here. 

In principle, excited state amides and imides can undergo electron transfer reactions. We did work a bit on that (DOI) and an early example on intramolecular electron transfer between an aromatic amide and a tertiary amine, resulting in amide cleavage, was given by J.D. Coyle (PDF).

In your case, however, the situation is a bit different. You don't have an aromatic amide but an arene and an aliphatic amide. The latter aren't supposed to exhibit a strong absoption at 254 nm, see an older article by Nielsen and Schellman (DOI). 

Even if you'd manage to excite the amide, I'd exclude electron transfer from one of the primary amines in your starting material and hence the cleavage of the amide.