The MFK-700 is nice for light routing jobs, like rounding over or chamfering the edges of a project, or flush trimming edging/nosing/banding. The dust collection on it is pretty stellar so I like it for these reasons.
Thing is, it never had accessories to put it on a guide rail. I needed to do this to rout the platen for the vacuum press before gluing up the veneered panels for Angle Madness as I needed to create a grid of V-grooves for air evacuation. The panels are ready for glue and vacuum now, long video soon :)
Here was my quick experiment and ultimate solution.
If you use the guide stop with the OF-1400 (the blocks that let you attach the router to the guide rail), you can either use the guide rods of the OF-1400 or the MFK-700 (they are optional and come with the edge guide accessory). Either way, you can use the rods to attach the MFK-700 to the guide stop. The caveat is that the hole spacing on the guide stop is a bit narrower than that of the MFK-700's edge guide. However, if you put the rods in with all the screws loose (on guide stop and router), you can then tighten them up. No need to crank on the screws, just snug enough to keep things from moving.
Another thing that worked was to use just one rod; once tightened up, it was pretty solid. I used two rods on the platen.
You'll want to put the MFK-700 half on the guide rail just like you would with the OF-1400. So what's the "foot" replacement to better balance the router on the other side?
Also remember to round the edges of this skate since you don't want it to catch.
A benefit of making the skate longer than the base is wide is that when I pushed the router off the end of the stock, the skate and guide stop balanced the router.
I'll be using it more on the rail now!