Well...yeah you can. I've got my own ideas - just wanted to thank you for the inspiration. Never thought of switching the trem circuit before and I think it'll be a useful trick.
If you look around, you'll see that most of the tube oscillator circuits Fender used are basically the same. Turning off the trem is just typically accomplished by grounding part of the oscillator circuit. And bias vary trem (or opto trem for that matter) is insanely easy to implement once you already have the oscillator circuit there; it's kind of just a matter of what you do with that oscillating voltage (and you can apply it to the power tube bias like in a brown deluxe or blackface princeton, or you can actually just apply it to a 12AX7 gain stage like in a vibro champ - I actually think the 12AX7 method sounds really, really good and it's less hassle than wiggling the power tubes). So, if you have a harmonic trem circuit in the amp already, all you really have to do is come up with a switch that takes the voltage oscillation out of the harmonic trem portion of the circuit and applies it to whatever else you want to wiggle in the circuit, in the correct manner of course. It'll take some experimenting and probably a 3 or 4 pole rotary switch, but it should be able to be done in one motion (nice thing about amps - there is usually room for giant things like multi-pole rotary switches in there). Alternatively, I might just try grounding half of the cycle and switching some filtering, sort of like you've done in the cardinal, and see how that sounds. I don't know yet, I'll see when I get there. I'm just excited about the possibility!
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Right; I'm planning an amp build with harmonic trem. Your Cardinal Trem circuit has given me the idea to install a switch so I can switch out the harmonic trem for a regular trem when I want to and I think that rocks. Thanks! 
