A small, but maybe somewhat essential, remark. Convoy changed the threads of the S2+ a few years ago. If you bought yours recently from Simon himself, you can assume your light has the new threads.
I used to buy pills from Fasttech but now they are all out and I switched to Kaidomain. The last ones I bought there still had the old treads. I don’t know any other reputable seller that sells them (old or new).
Your question looks like economical use of resources. One light with interchangeable pills. But atm I would advise to buy a second light, or a host, from Simon. And then swap, or put in, the emitter of your desire. I’ll bet the extra costs are beareable.
How often you plan to swap the pill. It takes more than just a few seonds, and it is not something I would like to do if the circumstances were not optimal.
FYI: reporters do have camera’s with interchangeable lenses, but in real life each has its own camera body because swapping lenses is too cumbersome.