Addng an extra volume to the Tele 4-way circuit is a little awkward, as it kind of gets in the way for the series setting. I have a couple of ways to do it in mind, but both involve compromises.

I did some quick and dirty tests earlier tonight on both versions with a 4-way and the two volumes, just using clip leads and guitar pickups, on my one string tester. Both worked as intended, each works a little differently and has slightly different sounds... but, I emphasise, it was a rough test.

I'll draw up both versions for you to try, there's only small changes between them, but I didn't get time to do it tonight. Hopefully tomorrow.