just skip the 2015 season completely and work your butt off for the 2016 combine and draft.
Who knows what will happen. I would think any NFL team wants to see if his knee/ankle/body would be able to hold up an entire season before committing any money on him so he may be forced back to BYU for that reason alone.
A side benefit would be he wouldn't play as recklessly which hopefully would mean he'd last the whole season.