Funkman's D-Lite - Contortion, Distortion
& 7#9 (Maj / Min)

Theoretically speaking, all you need is a tritone and 9 of the 10 remaining notes of the the chromatic scale, excluding (again, theoretically speaking) only the Maj. 7th (which works great as a passing tone, etc.), and you're good to go.
Think I'm lyin'?
Using D7 as an example for this post, let's build a chromatic scale and label each note's function (notes in italics are the altered tensions):
D=root; Eb=b9; E=9; F=#9; F#=3; G=sus4(11); Ab(G#)=b5(#11); A=5; Bb(A#)=b13(#5); B=13; C=7; C#=Maj7.
Only the last note C#, the Maj7 in this case, gets uninvited to the party, but it usually "passes" by via the backdoor, anyway.
Count 'em up. That's 11 out of 12 legit (and 12 out of 12 if we sneak that Maj7 in there).
Is that flexible or what?