This is from an old comment so the list might be incomplete, however :
Indonesia can provide :
Indigenous design :
Harimau, Pindad Badak, Pindad Komodo Mistral or StarStreak, Komodo CPWS, Cobra IFV
Homemade modifications of foreign vehicles :
AMX-13/105 retrofit, VAMTAC ST5, AMX-10P PAC 90 (amphibious capability).
Vehicles not yet represented in-game :
Leopard 2RI
Thailand can provide :
Indigenous design :
R-600 APC AT(105-120mm) and AA, AFV420 AT and AA, DTI AAPC, First Win ALV.
Homemade modifications of foreign vehicles :
F-5TH Super Tigris
Vehicles not yet represented in-game :
T-84 Oplot-T, BTR-3E1, BTR-3RK and Stingray, L-39 and A-37.
If we include other ASEAN countries we can reach 20-25 unique/uniquely modified vehicles and aircraft and if necessary some copy n paste vehicles. It however depends if Gaijin will actually bring in unique vehicles or just CnP.