Ok, so travel is a biggie (& honestly keeping your marital name won't make a huge amount of difference - I work abroad with my dc & get stopped & questioned regularly when departing the U.K., despite having kept my marital name for passport purposes). But you say you aren't currently worrying about that - fair enough.
Next thing, then, is him suddenly deciding he'd like to play Happy Families in oooh, I'm going to guess 2 years' time when he's got a new baby & his well meaning new dp or parents think it would be nice for the siblings to know each other.
There won't be a massive amount you can do to avoid this, even if you wanted to, & I'm sure you'd want whatever is best for your daughters. Whether being dropped & ignored, & then picked up again by their useless dad, is in your dc's interests, can get fraught.
All you can do is play it with a straight bat. Take the £7 CMS. Be clear that you are not obstructing contact, but that your dc's father has been absolutely clear that he is not willing to have any contact with his children. Document everything - emails, texts, whatever.
It's a bloody nightmare! 