Considering you're limited to 1 HS section, there's only one way to build an artillery support list for allies...to squadron 3 artillery together.
Not particularly cost efficient way of doing it, so I wouldn't recommend getting allies simply for a HS section.
You can throw a blob in, as a nice scoring unit, coupled with a squad of 2 medusae, a CCS with an LC and a vendetta. Not a bad little allied force, although quite points expensive, it still provides 2 niche elements that you'd probably want.
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