To some extent, there is already an "entrenchment" bonus. After an infantry unit's been immobile for a dozen seconds or so, it gets a defensive bonus until it moves
As someone from Czech Republic i can say for everyone, that speaking hungarian is very hard for us too. But for me specifically i don´t strugle too much with the pronunciation. When it comes to zrinyi, it was built on a Turán medium tank chassis.
It's not that bad for any Eastern/Northern European, but if you're from Southern Europe, the UK/Ireland or the US, yeah it's hard... Comes with bad language learning in those regions & countries
I wouldn't do any better pronouncing hungarian or czech stuff than you probably, its just as much guesswork for most germans. That old gun truck actually is from WW 1 - or at least it was featured in Battlefield 1. Zrinyi should be an indigenous hungarian design.