Please don't do the 'disband' thing, it will kill the attrition and the force preservation aspect of the campaign. Like I said previously the campaign is manageable with the force you get (especially after you replaced the T-72 turms by T-55MV's in the mission I mentioned ). The infantry core of the campaign was more than enough up until the mission I mentioned in phase 3 and I got into trouble because it was the weakest company of all my forces (both two groups) that got that task. So again, it is a matter of only small tweaking to the core task assignment and rotation in my opinion.
By the way, after reading your last posts I came to the conclusion that I had a contribution to my force attrition on that map since I methodically ignored your briefings on capture/win conditions (I achieved a surrender in all the missions before that mission that I believe was in phase 3).
If I may suggest - you could do a "mini mission" before each of the two final missions where you only move/don't move a truck into a capture area and hit a ceasefire. If the player moves it in he gets a full/partial/whatever you decide Refit level. If the player hits the ceasefire without capturing the objective he continues with his forces as it is.
P.S
I believe I read somewhere I can combine depleted different squads but I tried and failed to do it in CMRT since the combine button only works on the same already split squad. Is it CMSF thing only? How do i do it in practice?