Is it safe to get multiple chips? They’re about the size of a grain of rice, so it shouldn’t be too unwieldy to get chipped from a couple of different vendors at the same time. With a chip, GPS collar, maybe an AirTag, that’s about all you can do besides lots of training.
The chip will still be working after 24PetWatch is gone, you can enroll the same serial to more providers i.e. AKC Reunite.