you may be able to get an T-rail to standard 2x 10-32 adapter
(this)
and a normal drop forward, you may be able to get something to work by drilling and tapping a few holes.
otherwise, not sure if there's a drop with a t-slot (Yet)
Ydna of nummech.com fame is making prototypes, not sure on eta for production.
http://www.nummech.com/dev_eclipsedrop.html
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