The easiest back run of 9 or more examples almost certainly is a T206 from the 150-350 Series. It won't be any of the poses with a really hard to find Old Mill, but that still leaves some good candidates. From there you'd pick a pose that wasn't printed with a Hindu back.
My pick is Mike Donlin Seated. He wasn't printed with a Hindu back, and for some reason he is one of a handful of 150-350 Series poses that are fairly easy to find with an Old Mill back. I think the EPDG would be the toughest card to find, but it wouldn't take you too long to track one down.
Here are Donlin Seated backs:
EPDG
P150
P350
Sov150
Sov350
SC 150/25
SC 150/30
SC 350/25
SC 350/30
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