Yes, you can certainly do that.
Any reasonably qualified amp tech will be able to put channel switching into a tube amp, plus individual volume controls etc. etc.
People who don't own a Boogie will tell you it will sound '. . . just like a Boogie . . .'
As a Boogie owner for many years, who has heard this said many times, who used to work in a guitar store and had lots of opportunities to hear modded amps, I can tell you that it won't sound just like a Boogie.
Nor will it have the flexibility of a Boogie.
It may sound good - I've heard some good results from this type of thing - but I've also heard some really iffy results, too.
The bottom line is if you want the sound, you've got to buy the real thing. 
Sorry, but that's the way it is.
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