I personally think you should not ask them staffs... Ask the one who do skyblock updates/plugins would be better in my opinion xD (well if in the original skyblock you can change the isle owner then... ask le staff den)
Because this add-on isn't featured in the plugin they use, which is: IslandWorld. The only way to you can allow this feature is too send a request to the author of the plugin :p Otherwise, nothing can be done. You can click here, or you can use the following link: https://www.spigotmc.org/resources/island-world-skyblock-replacement.2757/ Requesting the feature is not a guarantee of acceptance, the author will have too think about it. (The feature use too exist, but it was removed by the author.)
There was a thread a while ago, Saying that the current plugin does support island owner changes, but can only be done by a op. But I am not so sure if it was true. However the request was declined: There is good reason, behind not allowing island transfers. http://itsjerryandharry.com/threads/need-help-from-an-admin-my-reason-repost.53650/
well if you really want to change the island ownership... it would be hard as grief and takeovers will be created. Changing the island ownership will require the other person or account holder to agree that you wanted the island ownership to be changed or else it would be a easy way to hack your island e.g Changing island ownership can possibly mess up the name change stuff so don't think its possible for now
It's really easy: If I give it I won't own an island anymore. And the one that I gave it to has an island.
If you want to make a suggestion, to allow them to happen, make a suggestion in the suggestion forum: http://itsjerryandharry.com/forums/suggestions.17/ But as of now it is either unsupported or it will not be done.