I dunno if i understand your question completely.....but this might help:
You can take a resistance soldier and give him a civilian skin by editing the missions.sqm, so infact you just "fool" the player into thinking the units are civilian when they are really resistance.
Here I'll give a quick example:
Place a resistance soldier on the map and name him DUDE. Then save and Alt+Tab.
Next, open your mission.sqm file, and use the FIND (Ctrl+F) funtion to enter the name DUDE and locate the soldier.
Should look sumthing like this:
      class Item1
      {
         side="GUER";
         class Vehicles
         {
            items=1;
            class Item0
            {
               position[]={9674.257813,8.662756,4401.107422};
               id=85;
               side="GUER";
               vehicle="SoldierGB";
               leader=1;
               skill=0.600000;
               text="DUDE";
            };
         };
      };
   };
Now we give the soldier some civil clothes by replacing the Vehicle name with a Civilian one.
Before: vehicle="SoldierGB";
After: vehicle="Civilian";
Now you can save and Alt+Tab back to ofp.
Reload the mission and preview.
If you did it correctly.... you should now have a Civilian, who has the heart of a resistance soldier. ;D
Below is a list of ClassNames for Civilian units:
_______________________________
Civilian
Civilian1
Civilian2
Civilian3
Civilian4
Civilian5
Civilian6
Civilian7
Civilian8 - Police(Sa61 Skorpion)
Civilian9
Civilian10
Civilian11 - Police (CZ75)
Woman1
Woman2
Woman3
Woman4
Woman5
_______________________________
Only drawbacks i noticed while using this method was that once the unit has been transformed....you cannot edit the unit from within the editor without him changing back to resistance/original uniform.
ie. adding or changing anything about the unit, like Skill, Init field, Direction ect. will result in the uniform being reverted to it's original state.
I suggest using the resistance unit until the mission is fully tested and ready to be played before transforming the uniform.
You can copy and paste transformed units without them changing back to original uniform.
You can also edit a transformed unit's direction by holding down the shift key while clicking on a unit and then dragging the mouse.
Hope this helps and wasn't too long.