Congratulations on your first pregnancy!
I strongly recommend getting a Bidet from amazon, I have Luxe bidet brand, only 40 dollars. It is very easy to install, I did it myself, though I would not recommend trying installing it with a pregnancy belly! If you have hot water source near the toilet seat, you can have a model with hot and cold water input and warm water would be very soothing down there.
I am 5 months port takedown, and go at least 10-12 times a day. I never ever wipe! Ever! I just use water from the bidet, and only gently pat dry afterwards - very gently. Otherwise my skin gets irritated and I get the itchiness and the burn. Bidet is a life saver.
I had seen a few research articles about delivery with a j-pouch, and the risk with C-section and vaginal delivery seemed similar. You can search
j-pouch delivery c-section vaginal
at google-scholar to access the research articles.
I have also read in the research articles that issues with the pouch function during pregnancy usually occur mostly in the final trimester, and pouch function gets back to normal after delivery.
Since your ObGyn knows that you have a j-pouch, at the first sign of trouble during delivery, they would switch to c-section from vaginal delivery. This happened to many of my "normal" friends. It is not guaranteed that you will have a vaginal delivery.
Vaginal delivery may cause structural damage to the pouch, and if that happens you would need further series of surgeries (and ileostomies) to repair/redo the pouch. If I were you, I would get a c-section. Why risk? I had to have a c-section with my son before my life with a j-pouch, because my son was at a breach position and the cord was around his neck. Millions of women end up getting c-section for much lighter medical reasons than having a j-pouch. Having an artificial organ that is under risk of structural damage is a very strong reason for elective c-section. My surgeon recommended me to get a c-section, if I ever get pregnant.
I don't mean to scare you, but your naive ObGyn has no clue as to how much suffering you would have to endure - with a newborn- if you pouch would get damaged. You would not be able to enjoy your newborn, and maybe even not be able to nurse your baby if you needed surgeries. I believe it is possible to have multiple children with a c-section.
Finally, I eat nuts chewing them very well. It seems like, for some of us, chewing well is the key to avoiding issues with "problem" foods.
Good luck!