Late to the party...
You can use GroupInitiative with tokens and no character sheets at all. You miss out on some of the automated behavior, but if you remove all the Bonus Stat Groups:
!group-init --del-group 1
Repeat until the output looks like this:
Then you can just select tokens and call it like this:
!group-init --bonus 7
or more generally
!group-init --bonus ?{Bonus|0}
You will get an individual roll for each token, with whatever bonus you specify being applied to it.
Note that this will apply the SAME bonus to every selected token. There isn't really a way for the API to call back to the user and prompt them for each token, which is why GroupInitiative works better with attributes on a character.