GB doesn’t really have anything F&F unfortantly, There’s an M113 platform that was so bad we replaced it with trailers, and the spin offs of the LMUK turrets that do have intergrated launchers for Javs, but that’s going to be SQN vics probably as they’re only export focused prototypes. (Technically the RWS on the Ajax can fit a Jav, but I haven’t actually seen anything saying that’s planned, nor has it been fitted on an Ajax).
Japan does have an option, but it’s a lil car with their version of a Jav on the back (Type 01 LMAT) so nothing ground breaking really and even then, there’s a laser guided system with a bigger warhead (Type 87 Chu-MAT) that’s probably a better option. (There’s also the MMPM Chū-MPM, but I’m not sure how it’s guided, and isn’t mounted on anything more than a pickup truck)
There’s a fair number of options for france though, EBRC Jaguar (with a twin mount Akeron MPs) and the VBCI-2 Export model that gets twin ATGMs (not the one in game currently). (There’s also 3 or 4 programmes that competed with the EBRC Jaguar that could reasonably be added)
Like the Warrior, the Javs are not mounted to the chassis, instead a poor bugger (a dismount) has to get out with a Jav and fire it off the shoulder. IIRC there are a few Boxers are going to be fitted with the Protector RS4 (like the Ajax) which can theoretially mount a Jav, but it’s yet to be done in british orders and I’ve not seen anything saying that’s actually planned
Czechoslovakia and Poland both have too many vehicles. While they could share a tree, it would mean many unique and historically significant vehicles would be crowded out. Especially in the late/post Soviet era, where they developed a huge assortment of vehicles to replace and compete with Soviet/Russian tech. Poland alone doesn’t have space in a full, independent tree for everything they made during this period, some things had to be left out. I can’t imagine how much more would be crowded out with Czechoslovakia as well.
I’d have to disagree, as there are a fair amount of vehicles the both of them share.
Additionally, what you say would exclusively be applicable for ground.
On their own their aviation trees are fair, but nothing spectacular. Together it would be quite good though.
Again with the AJAX, theoretically though the RWS, It’s not been fitted so far, hell, the RWS isn’t a standard feature and it’s only included in certain mission setups (and replaces the CITV)