Since the troopers and sgt are child to the squad, I don't know if this will work, but it might be worth a try. Treat the underslung Trench sweeper as an option to the assault rifle. The assualt rife should have the attribute remainder set for the exclusion group controlling the main weapon. The max allowed for the group should be set to "#" for the number of members in the squad.
The special weapons then should be in two exclusion groups, the main discussed above and a second that control the maximum number of special weapons allowed. That should give you the correct number of weapons that are allowed the upgrade.
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