I'd like to use an A6000 with a speedbooster as a second camera to my A7S, but I'm in love with shooting SLOG-2. Is there anyway to match the A6000 footage or is it way too laborious?

You have to transform slog2 to REC 709 - so there are at the end not significant differences between the pitures - except greater dynamic range. You can set A6000 very flat too.
I use both cameras togehther - A6000 as a flying camera.
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Does the A6000 have anything besides the standard Contrast/Saturation/Sharpness adjustments?

To make my NEX-5R more closely match the A7S I put contrast at -3, saturation at +2, and sharpness at +1. If you want to shoot flat you can also dial back saturation if you're trying to shoot flat.

Does the A6000 have anything besides the standard Contrast/Saturation/Sharpness adjustments?
A6000 has much more useable creative styles. Portrait and neutral have great dynamic range.