Sounds pretty straightforward to mod, assuming that you have your abilities to enter stealth on the same hotbar you want switched to stealth mode. That hotbar would then always be the active hotbar at the time you enter stealth (unless you were clicking other hotbars while casting stealth of course, but I suppose there is no reason to do that).
Upon detecting stealth mode (if there is DynamicData for this already, which I don't remember, just use that, otherwise mod the casting bar and to be sure possibly also the effects (or is it maintained?) window) have the mod switch the active hotbar bank and/or load a specific hotbar layout as mentioned above.
Just doing the ingame macro way proposed above is what most people do for stuff like this I suppose, pretty straightforward to configure.
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