As long as you go home with most of the contents of the hotel bathroom, eye mask from the place, duty-free chocolate and a bit of tat, your bond will not be broken at all. Small children are so easily bribed!
FWIW my 3yo does not get at all upset by Skype/phone calls. Neither did my 6yo. However, phone calls are easier - the absent parent wants full eye contact, the child can rarely manage to pay attention. At least with a phone call the absent parent doesn't see the present parent trailing the DC holding out the phone and frantically making gestures. I usually get the DC to draw/make something, then send a photo of that, so that DH then calls with something specific to say that I know the DC will be interested in. They can't remember what they had for dinner 5 mins before, let alone anything interesting they've done over the past three days. If you do talk, don't ask them for details of what they've done. It gets them flustered. Tell them silly things you've seen instead, or ask them to sing you a song, and don't push it if all you get in response is 'uh', 'mm', 'daddy can we have chocolate now?'... If you're feeling insecure and worried, they're going to pick up on that and will, in turn, be upset by the pressure.
I do think your DH has to accept some responsibility here - he can't unanimously decide that no contact is the way forward to avoid short-term upset, he needs to think about what he can/should do to avoid longer-term upset. If he simply doesn't mention you, and they don't hear from you, for two weeks (a long time in their lives) what are they going to think/fear? He needs to make a countdown calendar with them or something, and prepare them for phone calls. He's being lazy. And his parents need to butt out, FA to do with them.