[kia345]

I could see promotional offers that would allow people access to Gk.

I suggest bringing back the entire trial island, or adding more to this smaller one. Give them unlimited access to that island. Give them a large sea gmap to sail on. But they're limited to that island, with no access to quests, higher level dungeons, or rarer items. The new island could have dungeons to slowly grind to 15, have small shops and blacksmiths that craft only weak weapons. That could be enough to entice them to upgrade and see the real Gk.