Curious as to why you've mentioned OziExplorer and MapWel as (assuming we are talking Garmin units here) all you need to do is extract the GPX file from the origianl unit using Mapsource and then e-mail it to the other people who can then use their own version of Mapsource to upload the GPX to their own GPS).
OziExplorer can be used to overlay the GPX file on a scanned [raster] map and will run on PCs or laptops or PDAs/Smartphones running Window Mobile. Mapwel is used to convert raster maps to vector maps for uploading onto Garmin GPS units so it depends on what type of GPS the end user will have.
In case you didn't know, you
(1) can scan paper map (usually in TIF or possibly PNG format),
(2) geo-reference them using OziExplorer (I do something similar in Memory Map) - this involves clicking on a variety of spots on the map where you know the co-ordinates and assigning a co-ordinate to that spot
(3) load up the original GPS file (typically a GPX file or MMO for Memory Map - OziExplorer will propbably have it's own format) which will overlap correctly on the scanned map
BTW: I used Mapwel once and uploaded a fairly small area to my Garmin Legend. The resultant file was far too big for the Garmin to be able to re-draw quickly enough to keep up with my riding speed. Having said that, trekking in Nepal will be somewhat slower than my riding.