The main thing is to be as sure as you can that the body of the pipe is high quality. I saw many inferior pipes fitted with churchwarden stems. Adding a long stem to a body made of poor briar or badly made will not turn it into a good pipe.
No worries there. J.M. (Boswell) does not make bad pipes. And his briar wood is top shelf.
“ECONOMY, n. Purchasing the barrel of whiskey that you do not need for the price of the cow you cannot afford”
- Ambrose Bierce