In my oTORG games, I generally had several flavors of this:
- Technomagic: Using technology to simulate magic/miracles/psi (I was a Babylon 5 fan)
- Occultech: Using technology to boost magic, from Tharkold.
- Spiritech: Using technology to boost miracles, from the Cyberpapacy.
- Psitech: Using technology to boost Psi. I had the Kadandrans (Hachi Mara Two's people) in my campaign.
The balance usually was that you were creating a contradiction if the Tech Axiom was too low and running the risk of cyberpsychosis. A lot of it was just flavor, such as using cyberchips instead of grimoires (nowadays I'd probably have e-reader spellbooks
Also, there was always the chance that your enemies could damage or steal your tech.
In the end, if you and your player have a cool idea for a techomage/psi/miracle worker, run with it, and adjust if it seems too unbalanced.