Nintendo can just as much detect you using RCM with a jig as they can detect using a Joycon mod plus you can only use your switch offline anyway so why even go online using RCM ? But i'll leave you be seeing you adjusted your post, just wanted to give my 2 cents that the original claim you made a joycon mod costing more then a jig well is incorrect. That's all
First, I don't go online. Updates can be installed manually offline, which can contain the brick code I mentioned.
Second, not everyone want to modify and to solder their daily driver Joy-Cons.