In reply to phja:
There is a cool long via ferrata in the Brenta dolomites, it's about 2 to 4 days long depending on how fit you might be. There are paths all over the place around it so it would be pretty easy to arrange to meet up with your other at huts or a bit before reaching them. Or you could do part of the via ferrata for a single day - walk up the path for a bit together then split ways before the via ferrata; other takes the low way, you take the high way, then you meet up later on.
Tofana Di Rozes has both an easy path and a fun via ferrata to the top.
Marmolada has a via ferrata and a cablecar to the top.
Generally, if you buy a few Dolomites maps, it's pretty easy to look at them and plan a route with via ferrata options.
I would caution you though:
Sending someone who is incompetent off to meet you at a particular point with a map and a pat on the back isn't a great idea. If you have to turn back mid via ferrata because it's buried in snow or the other gets lost or a thunderstorm suddenly sweeps in, there is all sorts of potential for acrimony/injury/rescue.
The paths in the dolomites are often not that easy to follow if it gets dark and the prodigious quantity of vertical ground means that there is often no easy way to just retreat back down if suddenly forced to turn around in a hurry (in the UK, for comparison, 99% of the mountains can be walked off in a simple straight line till you get to a river and that followed to a road so screwing up your navigation is, by comparison, not very serious).