I think it's such a good idea to continue with low fat for a good while, if not for life. Pancreatitis is so awful, and hopefully he'll never have to go thru that again.
Yes, it can So long to recover - same as in humans too - months!! Humans can end up in the ICU just from the effects of pancreatitis
I fostered a pancreatitis kiddo - and he did great on RC - but I think any of the options above would be good Rx brands.
Hope to hear of continued progress

!