I won't disapprove of an imaginative way but keep in mind crest-bearers need to find a crest and tag, Tamers-method require biomerging and need to have cards, and jogressing will require either two tamers or one tamer to have two partners. And Fellsing's gonna have to organize it all.

I mostly suggested the Savers method because it shouldn't require extra set-up and there can be a ban on digimon-punching.