Edited*
I’d just go with a hardware store L bracket with a center slot cut to fit a 3/8″ bolt, some 3/8″ washers, bolts and wingnuts, maybe some nylon washers to avoid slippage. Photographic ball heads usually have a sturdy vertical position that would offer an alternative if you could find or retrofit one with a 3/8 bolt
If you need to operate pan/tilt, you’d be better off sourcing a Lambda head and Mitchell plate tripod.
Just the first thoughts that come to mind.
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Angelo Lorenzo
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