Also the festool planer I think you would need to feed it from left to right as the EHL850 kit does when upside down mode, so the sliding table you'd need to swap around.
The EHL850 has a bench top accessory just for this operation anyway, pricey but it works really well but it's not designed to fit in the cms, just secured onto any bench top.
Comes with fence and guard etc. Very good piece of kit. I suppose if one secured it to a module made to fit the cms or placed onto and secured it may work.