I need a suggestion, please...

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I'm assuming you have them mounted on top of one another.

If so, possibly an extension arm slid between the two units...mirror ball motor mounted on the end, with lighting mounted on the tripod stand.

????

Thats what I do. I have a short arm that I stick straight out with a battery powered motor on it. that & a 12" ball & you are set.
 
I'm assuming you have them mounted on top of one another.

If so, possibly an extension arm slid between the two units...mirror ball motor mounted on the end, with lighting mounted on the tripod stand.

????

I'm doing the same thing. Perm-mounted mirror ball motor and I got a threaded, steel rod that sticks into a hole, drilled into the t-bar. Works great.