EOTech = Insight = L3, they're all the same switches from the same OEM, and there is a wide range of lengths available, I think the shortest I've seen are 3" versions, and I even have a 24" version.
The Insight-pattern plug, "sometimes" called the Crane-pattern these days, is the same one used on most LDI/Steiner/Beretta units, as well as the MAWL.
The Surefire D-R-IT has one Insight pattern plug, the LDI/Steiner switches have the same plug, and the TAPS have Insight compatible plugs.
The M-LOK adapter that is compatible with Insight switches would work with the switch you linked to, because the remote pad is identical, it's only the cable length that varies.
However, if you wait long enough and keep an eye out (or even post a WTB), used Insight plugs sell by the boatload at anywhere from $5-$20 a piece, shipped, with the most common lengths being 6-7" and 12". No need to pay B&H $72 + shipping.
~Augee