Hmmm this is risky but you could go Slann and EoG and drop the basilidon, keep EoG within 10 of the Slann and you roll 4 dice not 3 and discard one making the 14-17 possible all the time, that way you can probably summon in 30 skinks turn 1.
What's the rule regarding being allowed to role 4 dice?
At least 20 skinks are a relatively cheap box set, plenty of painting practice