Yeah, it's a bit of a bother logistically because of where the embassy is located, and one cannot be sure you get processed that day if the queues are long. So

Yeah, it's a bit of a bother logistically because of where the embassy is located, and one cannot be sure you get processed that day if the queues are long. So I keep just one of the passports as paper version (the country where I reside) and use that when travelling. For the other one, I have no paper passport; I do have the social security number which I can use when necessary. Mind you these are two Nordic countries so it is not much of a difference either way. Even for voting, which the tool misses, is conviently done. I vote in country B elections from country A. They have lists of country B social security number with a name for the eligible votets, I have the paper which they mailed to me from B and present that while I prove myself using passport/driver's license of country A. Then I vote remotely, in advance to the actual voting day. Voting in EU elections works the same way, but is done for one country only.