Well, it’s basically merchandise content you’ll get so it won’t be sold and paramount pictures tells what exactly can be included and what not.
Also due to the rating of MSFS (“everyone” in the US) you won’t see any official combat related stuff in any official DLC/market place item.
So even if the DLC was paid systems especially created for combat won’t be included unfortunately.
A DLC with everything would have to be rated separately and there would be the need to validate if the player meets the age to obtain this DLC - with this background it would be a better idea to create the reincarnation of the CFS…