I always felt that the Btr60/70/80 platforms could have been fitted with more different types of weapons than they actually fielded. The 120mm mortar system was a good decision. But the potential is huge and it seems Cuba was the only country to fully expand on weapons mainly through necessity and using what they had in stock. Cuba fitting weapons such as zu -23-2, single and double 37mm 61-K, double 57mm, and even the turret from a T-55. So simply using older equipment can give you a different capability and it's a good way to use up older stock.
The list below is just short list of possibilities:
PT -76 turret
Bmp -1 turret
Bmp -3 turret
Zsu 23-4 turret (Air and ground support role)
BM-14 140mm (single or double pack)
Zis-3 76mm artillery
D-44 85mm artillery
Various 122mm artillery pieces
130mm M-46 (possibly )
D-48 85mm anti tank
BS-3 100mm anti tank
T-12 100mm anti tank
82mm automatic mortar 2B9 vaselik (can also use anti armour rounds )
160mm mortar (possibly if recoil dampening system introduced )
Strelets anti air system
Sonsa -R anti air system
Pantsir (possibly )
Tungkuska (possibly )
Zu-23-2M1/ZOM1/ZOM1-SM anti air system
Zsu 23-4M4/M5 anti air system
And the following ATGW systems AT-3, AT-4,
AT-5, AT-6, AT-7, AT-13, AT-14. AT-15.
and I know that there's no doubt many other options.
Is there any options you would suggest?