Phew, ok, it means I have the dates right. Now just need Covid 19 to go away on the continent by 2 months time

I have heard back from 2 more Belgium vets (I did get a bit carried away and thought I'd canvas a few!) and they also confirm it is 12 weeks. Phew.
Can I just pick people's brains about vaccinations and what it would be best to do with this? I live in a low risk area for parvo (very isolated, no cases for 5+ years) so I usually give 1st vaccination at 9wks (only DHP) and then a 2nd vaccination at 20wks to be sure I've missed maternal antibodies (also just DHP). I don't usually give any lepto.
The breeder's vet is giving 1st vaccinations (sadly) at 8wks, and I'm pretty sure it will be DHP and Lepto. I plan to gently enquire about whether they might skip the Lepto for my puppy but I really don't think I'm going to be successful with that one. (Very established breeder...). Then we will be collecting the pup at 9wks. (Which is when the breeder lets pups go, at the earliest.)
Then we need to have the rabies done at 12wks so we can get home...
What do I do with the other vaccination? I don't want to give it too close to the rabies, because I know that takes a hit on the immune system. I want to leave at least 2 weeks before and after the rabies jab, before giving any other. And I won't give Lepto - even if the pup had one Lepto already. So I have no need to give another jab within 4 weeks of the first jab, because I'm not boosting the Lepto.
My options are:
1) Give another DHP at 10wks (then rabies at 12wks). And then I would probably need to give a third DHP at 20wks when we got back home, with my own vet. Because 10wks is a bit young to rely on maternal antibodies having gone. I know titre testing is an option but this is a high energy breed that to restrain for a blood draw is going to be quite an unpleasant experience at the vet at a young age, so I'd rather avoid that.

This option also involves having the "I don't want Lepto" conversation with a Belgium vet which sometimes doesn't go down too well... (My own vet totally knows what I do and is ok with it!)
2) Just give the rabies at 12wks whilst we are abroad, then go to our own vet when we get home for a 2nd DHP at 20wks. I like this option but I worry the pup won't be protected in Belgium whilst we socialise with just one DHP jab at 8wks... But I could just try to avoid high risk places and carry pup in those locations and that kinda thing.
I think those are my two choices. If I wait until 2 weeks after the rabies jab, that will be 14wks - and we will be coming home in a week's time, so that seems a bit silly rather than just waiting another week...