I've heard there is a way to convert vyvanse (ADHD medicine) into adderall, how would one do that?

I have vyvanse (prescribed) but it doesn't seem to work. If I remember correctly, someone told me there is some type of protein one could find in a health store (such as GNC) that converts vyvanse back into adderall RX through some chemical process.(??) The difference between vyvanse and adderall is that after adderall is ingested the effects are more immediate and therefore, more noticeable for me. On the other hand, vyvanse is extended release, being released later through digestion and lasting/peaking with milder effects for longer/later in the day. I want to convert vyvanse into adderall for the purpose that adderall is the only ADHD med i have taken that works consistently, because the gradual peak of focus doesn't cut it for me. I need to go hard or go home, basically. I would not abuse this drug so don't even start. But even the adderall extended release (XR- not to be confused with RX, regular adderall) doesn't cut it. Feeling the effects immediately tends to give me the drive from the start of the day to get my priorities in check. SIDENOTE: Vyvanse does help me concentrate, but I still feel the effects of my ADHD as so: I can focus, but only on things that interest me, otherwise I can't even start to concentrate on schoolwork. With adderall RX I have been able to focus on anything I must focus on. The only reason I have not been prescribed adderall is because they usuallyprescribe the extended release version (adderall XR) or vyvanse to young adults for fear of abuse. I know adderall RX works, however, because i have taken it from a friend for finals in the past, taking reasonable doses. Also, with extended release, i have trouble sleeping at night, as the lasting effects keep me awake. If anyone can help me turn my vyvanse capsules back into the adderall RX form, that would be awesome!! I'm a bright kid, but my ADHD has been a factor in many of my shortcomings. I hope to one day work as a chemist, help me start my first self-motivated lab! :)