Well, you could get a 3-way switch, I'm sure. That might be "better"; I was just spitballing on a cheap solution. In my secondary systems, I'm doing the switching in the TV instead of the receiver, and I kind of like that. It seems to simplify the overall UI. I'm not hung up on that particular switch as much as I am suggesting to solve your HDMI input shortage and do the switching in the TV instead of doing the switching in a receiver or soundbar.
Once you've done that, you could take the single audio output (either digital or analog) from the TV and still do whatever you want with it - like add powered stereo speakers or power your VP150 with a t-amp or something. I suppose it would depend if your TV volume control "works" on its analog and/or digital outputs.
