I like this mechanic, or rather the idea of it, but it is a pain to re-summon.
Perhaps summons need to be easier, and instead the graveyard mechanic could do something slightly different, for example:
1) Give some meaningful buff instead
2) Start a 1 hour/30 minute timer that your (dead) pet can then be re-summoned at will outside of a graveyard.
3) Level up your pets in some way, currently they seem quite weak compared to the new animal handling.
4) Act as conduit to turn unleaded bones into summon-able bones you can use later outside a graveyard
5) some other interesting thing.
The graveyard mechanic is interesting, yet quite tedious barbecue of pet deaths. Current strategies of killing yourself 3 times to make 3 gravestones so you can summon outside a graveyard doesn't sit entirely well with me. In the same way that the previous mode of death travel to Serbule didn't