[Elecraft] W2 watt meter- multiple sensors question

[Dave Fugleberg]

I see that the W2 can support up to 2 remote sensors, selectable from the
front panel.
Is it possible to support more (say 4 total) with some kind of external
switching arrangement?
I have a K3 with three XV series transverters (144, 222, 432). Each
transverter feeds a power amp and connects to an antenna for that band. I
currently use separate external meters at the output of each amplifier. I'd
like to replace those with a single meter that can monitor whichever band
I'm transmitting on.