Whilst US forces use laser guided artillery rounds sparingly, this is not so with the USSR, a significant number of 240 mm Smel'chak guided rounds were used in Afghanistan and Chechna, which were apparently quite effective at clearing caves and bunkers.
http://www.globalsecurity.org/milita...russia/2s4.htm
To model this, perhaps a FO can be created with a HE ATGM round, with HE kill and warhead of 240mm mortar ?
Also the Krasnopol 152mm laser guided munition is widely available to Russian arty, it is not nearly as fragile and expensive as the US Copperhead 155mm