Got it, so tone is Post-preamp and the UK/US switch (which as far as I've read is pretty much curated settings of bass and treble on the Chimera) is actually Pre-Preamp? That would explain the distortion getting much tighter when the UK switch is engaged and the amp is overdriven. If this is the case, it could be pretty easily emulated by using an EQ or something like the TEEMAH with drive at 0 before the amp.
I gave the Voltage Queen a shot last night, not bad! Using just the pre-amp section and running it into my Marshall Astoria Classic Combo sounded pretty damn similar in the room to the Benson Preamp pedal!
If you don't mind me asking some questions about the Monarch Circuit, would the over all topology lean towards the 5E3 side, not just the tone control but everything from how the input is filtered to how it saturates/overdrives etc? I heard I an interview that Benson himself mentioned that when developing his amps, he intentionally designed them without any kind o mirage cut at all, quite unlike most amps from what I understood which has some kind of cut in the midrange regardless o how the tone controls are set. Is this something you can confirm?
If so, I'm thinking that the Grammatico and/or Fullerton models, perhaps with a slight mid boost pre/post might be a pretty good fit for this kind of thing as well?