I broke one open, the contact isolation was larger than most cheap antenna switches, and was larger than most relay contact isolation on TR/RX relays, I measured around. You might use them in pairs.so as to implement a more complex dummy load safety function. I need to break one open and look ––but even 3-way 110 vac wall switches may have possibilities at HF for having decent isolation at moderate power. There's a lot of possibilities for switches, there are some wide spaced ceramic rotaries that aren't too costly. Prolly not too much of a problem with 100 watts belo 28 mhz. The problem with that is that standard switches like that are not rated for RF or sufficiently high voltages, and you have little isolation between the signal paths so tons of leakage from a transmitter into the other rigs receiver. Build one of these to switch the rigs, cost is less than 10 bucks
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