Currently if you try and use the -fate command for surge 26 "Imprisonment spell on caster" you get a will save which you will always succeed by the time you get the ability to use -fate
So what I am suggesting is to remove the will save roll from this surge when it is triggered by -fate so that Wild Mages can willingly send themselves to "imprisonment" which could act as a place that wild mage PCs can go to meet in secret or just use the workbenches even.
Note: This area would not be impenetrable to non Wild Mages since wild surge 84 has a chance of sending others to imprisonment