In my humble opinion, there is a solution to your concerns, although it is a slow one.
I myself would like to be able to cast magics in armour, and to this end I have taken some small skill in an unusual facet of training called Stilled Magic (Still Spells). This feat allows me to cast magic in armour. My research has further led me to believe that when I become more adept at this skill, I can develop my feats in it through three levels to be able to make my spells automatically fit this technique so they will be cast at their original level.
I wish you good practice in your endeavours.
~ Xaltotun