If you get heavy armor, you need gotta get POWER ARMOR!
This is a magic hack for 11th level technomancers
Powered Mage (Ex)
You gain proficiency with Power armor and the ability to cast magic in Power armor.
Thoughts?
Daily Punch 4-11-19 Powered Mage Technomancer Magic Hack for Starfinder
Throat Punch Games 
“…and the ability to cast magic in Power armor.”
I think this is unnecessary. In Starfinder, you can cast spells while wearing armor without any restriction, as far as I know.
I think you are right, but I was hoping to get some more armor on my mages. I think I will add to these later as a feat isn’t as fancy as some other options a mage can get.