I don't know what you're saying here, since you didn't include a message, but since the RFID tags costing about a penny do only one thing, namely, to announce their presence, and they do that on receipt of sufficient energy with which to do that, my assumption is that they can be "persuaded" to announce their presence on command.

If they do that, then they'll tell a remote "listener" that they're active, which the "listener" can interpret as "sensor 3127 is active" or "switch 49 is closed," and then take appropriate action. Since they have an id code that's long and unique, at least enough so that no two pairs of jeans, or socks, or CD, will have the same code despite world-wide distribution, there'll be no confusion about who's who.

If a given station has a dozen of these, then it can, clearly, generate a dozen messages, each of which can be detected from the "other" side of a wall, if needed. Since the things cost less than a bypass cap, a dozen or two per station would not be a burden. Now, any hardware they require might become one, particularly if each station has to figure out how to receive a message, but that's TBD. What's appealing about this is that they're cheap and will be widely available.

I don't yet know how I'll manage the problem associated with the response of my shirt's RFID tag ... but, where there's a will, there's a way ... In any case, I've got to consider such a low-cost option, until it's clear that it suit the task.

RE