If you want B/T/tone, and blend/vol, your wish not to have stacked pots is rough. However if you leave T away, put the output jack to side or back (consider Strat style plate, like in Ritters have), you could have 4 pots in the front. Or if the T has switch and works as a tone, too, that would do.
I think John East had one option, where all adjustments were divided to separate pots, but I couldn't find it now. His preamps are highest end, and are designed in a very interesting way. John used to design mixing consoles, and it can be seen in his creations.