Well, you could treat the Royals like we talked about Dragoon mechs being fit . . . limiters/governors to keep the range/damage/power down when you are under observation or if someone can get away. Flip a switch when you have them pinned.
Even a 'governed' pair of IS ERPPC on a Marauder 2R will make a difference. So they can only hit out to 18 hexes by the program, your med range is still 14 hexes, short is 7 and you have no minimum.
Might be fun to play around with some folks who are acquainted with the 'affair' . . . pirates/mercs have a numbers advantage, keep winning and causing losses . . . then the disguised ComGuard break them with 'surprising' accurate weapons . . . chase down the small bands trying to flee, they think they are safe running at 20+ hexes . . . *flip* BAM . . . pair of ERPPCs slam into the back armor of a running Thunderbolt.