Certainly on Scenic 11 and probably meganes, manual handbrake fixings are there for the lever at least. Will need lever and tray/trim but levers readily available on
and trim should be from scrappers.
and cost is okay.
Not sure if cable abutments/cable clips are on underside but worst case is fabricate a couple and bolt em on.
Calipers are different between electronic versions and manual ones. The lever and abutment positions are slightly rotated.
I'm told by nice man at TRW (caliper specialist) that this difference can affect the electronic brake operation but fine on manual. You'll have to make up your own mind but I'll leave the automatic brake calipers on and see how they perform if I ever do this changover.
You'll need a handbrake switch for the red light if you still want that to work. And sort the wiring but I assume the loom connections will be there.
Will almost certainly need to be programmed to tell the wee beasty that the electronic brake is no more. Whether an official Renault clip is needed or if one of the more universal professional readers will do this, dunno.
I got very close to going ahead with this recently but my unit seems to have settled (touch wood) and I no longer have the pressure of an MOT.
But costing should be well less then 100 and some time/thought
Compare to a reconned motor unit (200) and set up/fault code clearing if (when) my motor breaks, it is a tempting thought.