New suggestion for English, adapted from the Bislama creole:
1st person pronoun = mi
2nd = yu
3rd = ðe ("they")
Combine for all the plurals:
yumi = 1+2 (you and me)
miðe = 1+3 (me and them)
yumiðe = 1+2+3 (all of us)
yuðe = 2+3 (y'all)
ðeðe = (all of them)
(Maybe yuðeðe for the singular/plural they distinction, too.)
Actually, yuyu, yuðe, and yuðeðe all preserve interesting shades of meaning.
yuyu = plural you, the group I'm addressing
yuðe = you and the (singular) other person
yuðeðe = you and multiple other people
yuyuðe = group I'm addressing and the (singular) other person
yuyuðeðe = oh come on
All of these are subsumed by "y'all" in English.
so tab today