Six years ago, I went to Mayo Clinic for a second opinion after I had a malignant polyp and recurrent high grade dysplasia in my anal canal. An ileostomy was recommended by my GI and also the surgeon at Mayo. I asked about getting a K pouch (had already researched this option) since I strongly did not want an ileostomy with its associated issues. I later learned that Mayo only does J pouches. I opted to get a BCIR (modification of a K pouch) and it has produced excellent results for me. Please feel free to send me a PM with your contact information. There is more information I can provide in a phone conversation.
Bill