@Angelos_Pikoulas Why don’t you just go for a FW 13 then? Sounds like your use case is mostly desktop use, so a FW13 with external GPU and displays sounds perfect. Since you also don’t seem to care about the other advantages an AMD FW16 offers, like extra performance or battery life.
On that note, afaik the top two ports are fully-featured USB 4 which is just as capable as TB4. So unless you use non-standard TB3 docks it should work, in which case, that’s on them. Not too knowledgeable about that either, got it from this thread.
And if you want top-tier eGPU performance, you might want to be on the lookout for OcuLink boards that you can put in the Expansion Bay, it has some disadvantages (like not being hot-pluggable, you’ll likely have to shut down the laptop to connect/disconnect), but it will be more performance than TB3/4 will ever be, by providing 4 times the bandwidth to the GPU.