I agree with you on the hallmarks of VBCW but quite a number of WW1 or 2 rulesets cover these, or should do. Not sure I’d use 40k for conflicts involving pre-radio communication and I've no experience of FoW so can’t comment, but there’s a running list of rules that work well for for VBCW here:
https://leadadventureforum.com/index.php?PHPSESSID=90knoilevcc17jio9rfd6mk7p0&topic=104435.0Adding event cards adds ‘colour’ to a specific period or engagement. Finding out that Pike forgot to load the Vickers spare ammo boxes, being chased out of a secure position by Mrs Miggins armed with a rolling pin, having a section disappear behind the bike sheds for a crafty fag (UK usage only....oh, I don’t know.....) all can give players some tricky decisions if they crop up at key moments and can be used with any rule set.
Or with suitable alteration for any period in history - humans haven’t changed much since the Bronze Age