That players have to make a choice between whether their edge points will come from pk or exploration/observation, but not both?

Someone then has a choice of being an explory type char and getting their edges that was, or a pk-type char and getting their edges that way.

The flaw in the whole edge plan was that someone designed to help those not really focussed on pk (obs and explore exp) ended up being farmed by those who are focussed on pk. I think my suggestion could address that.

You'd probably need to tweak some edge requirements so that those that have an observation or exploration exp requirement (say) don't continue to do so. IF I take twitchy as an example, maybe an explore type character can get the edge at an earlier level than a pk type character, but a pk type character can get something like kansetsuwaza adept at an earlier level than an explore type character.

Or, rather than make classes have more in their standard, maybe give everyone some starting edge points, so that they can customise their characters a little even if they suck at accrueing edge points?