41 Field barrels interchange with other 41 barrels but not all 41 barrels go on all 46 pistols or vise versa, I forget which. If you search you'll find threads on interchanging 41 and 46 barrels.

As much as I love them, there is a very small market for 41s or any other expensive .22LR. Field barrels would in turn be a fragment of the small 41 market. I doubt there is enough demand to stimulate S&W's marketing department but there is an alternative. My gunsmith has shortened about a half dozen 7 3/8" barrels for customers. I have one and it looks better than originals because his polish is better and he cuts them at 5 1/2" which leaves full scallops on the lower front sides. Cuting them a 1/2" longer prevents them being sold as original which would be fraud. An original would be nice but I'm happy with mine.