A 12AY7 is also a good choice. It has the higher impedance that you want in a preamp tube, but less than half the gain of a 12AX7. It will still be a loud amp, but more adjustment range in the clean headroom and less distortion if you open it up.
V1 is the best location for it. There's not much point in putting a lower-gain tube in V2, since that's the tone stack recovery stage--you don't want to dull the tone and less gain in that stage is essentially the same as turning down the master volume.
If you want to play the Blues Deluxe quietly at home, the easiest solution is a volume box, which goes into the effects loop. They're readily available on eBay.
I think those amps may have linear pots in them instead of audio taper. An audio taper at 1/2 would be about 20dB less loud than at full. A linear taper at 1/2 would be only about 6dB less loud than at full. If going from full to 1/2 doesn't do a lot, it's a linear - have it replaced with an audio.