No, because some units are not available to the Aedui/Arverni. Also, wouldn't be 'elegant'.

If my guesses are worth anything; it entirely depends on the Epeirotes having conquered the Illyrian tribes & some Thracian ones such as Odrysai/Triballoi whether or not they will actually support you. (Those regions are apparently too tempting for the AI to resist; yet manage to see the Epeirotes off each time in some circumstances.)