The thing that would make the most sense to me would be to use a decent tube preamp in the HT bypass loop for your music sources. That way, you could have tubes in the signal path at the push of a button.
With two pairs of amps there's not a real easy way to avoid a lot of clutter, and some switching issues...
With two pairs of amps there's not a real easy way to avoid a lot of clutter, and some switching issues...