Pentasa can be opened into applesauce
But the blue coating is what makes sure the white beads survive the stomach and get distributed to the right part of the intestine.
That said pentasa is very mild and only acts like a cream on the top most surface of the intestine - Crohns goes through all layers .
You said he takes mtx pills -some do better with mtx injections since absorption is not an issue from a disease standpoint
That said Ds does great on the pills in terms of side effects but gets very sick on the injections others have the opposite
EoE - typically is due to increased eosinophils without a known inflammatory disease.
Crohns can and does cause increased eos in the GI tract
Most EoE is treated with diet (top 6 free or oral steroids ) some need both
Formula only can be used for both Crohns and EoE until things calm down similar to pred
There is a group of parents solely for EoE
Here
https://community.kidswithfoodallergies.org/forum/gastrointestinal-disorders
And apfed has a lot of good resources
https://apfed.org
Can you get a second opinion at one of the top three big ibd centered in the US?
Boston children's
Children of Philadelphia
Cincinnati children's
Fwiw Cincy has the center for eosinophilic disease which is one of the top in the country as well
Refusing to take the pills
Does he see a psychologist
Most GI dept have a psychologist for medical coping which does help ALOT
Dealing with all of it is a lot for adults let alone kids
Having someone who isn't mom or dad to vent to is important
Also it's very important to give kids a sense of control since most of the poking etc is stufff they are told will be done and they don't get a choice
So Ds gets to chose where and what order pills are taken in
Where he gets his shots (humirax2 week) in his leg etc....
Also after emptying a capsule applesauce put the blue coating in water
Show your kiddo how thin it gets with water
Sometimes the shear visual size ....
If he is having trouble with choking feeling or things getting stuck due to EoE
Then it may be harder for him
Most kids with EoE feel like they are choking especially on meat due to the strictures of the esophagus
Good luck