I own an SQ6, as does one of my clients. I have a GX4816 but they are waiting on supply-chain and will not have one until October.

We have a gig in August and I was wondering if there was any method with what we have currently to use one SQ at FOH and the other for Monitors from the same GX box? I am picturing the GX port to my SQ at FOH for Gain-control, and routing the inputs out of the DX 1 port on the 4816 into the S-Link on the back of his SQ for digital trim at MONs? Is this possible with tie-lines?

If it IS possible, what clocking issues do I need to be cognizant of?

I have a Dante card, but he has no card currently.

Please advise. Thank you!