If I understood correctly, you want to keep the top layer polygon ground pour further away than what you "normally" get (per your clearance rules), for whatever reason (I can't quite understand why, but let's not discuss that).
For that purpose, I'd consider using "polygon pour cutout" feature. You can draw any shape you want, and the pour doesn't go inside that area.
http://www.altium.com/documentation/17.0/display/ADES/PCB_Obj-PolygonPour((Polygon+Pour))_AD#!PolygonPour-PolygonPourCutoutThe same works for internal layers if you did them as standard "layers" & polygon pours on them, instead of using "planes".
With planes, you need to just draw a polygon, fill, heck, even bunch of lines there if you so wish.
I almost never use planes myself, because often I find I need to place a trace anyway on the inner layers, even if they are "mostly" planes. So then you just need to do them as "layers". Easier to think about when all the actual PCB layers are drawn using the same "technology", instead of some of them working differently.
So maybe don't use "planes", just four identical layers - less confusion for you!