Why not a direct-fire 81mm mortar?
A direct-fire version would be cheaper, lighter, shorter than the Cockerill 90 or direct-fire 120mm mortar. It also doesn't have the backblast of the 106RR, so it can conceivably be mounted in a turret.
It would bust MG positions or many bunker types. Flechette could deal with massed formations encountered recently. It could get at high-elevation targets and still be used in indirect-fire mode. It can fire smoke marker rounds for supporting aircraft.
And it would be something that could be mounted onto some Simbas/V150s, maybe even the proposed Barako.
I'm hoping a local company could look into this.
A good description of such a 1960s-era weapon:
http://pcf45.com/misfire/mortar.html(Note: As used then, it could also be mounted in riverine or coastal patrol boats)
A 2003 US Infantry Mag article advocating adopting the weapon above to humvees:
http://findarticles.com/p/articles/mi_m0IA..._114049377/pg_2