i like the idea of it just bieng a hologram and not a real shield. here are some stats that reflect that idea.

+50% recharge rate
+25% turns speed
+20% charge speed
+20% charge length
-50% shield bash damage
no resistances
(hidden) not usable in medieval mode

i feel like these stats would:
1) have this shield be more useful utility wise, sacrificing usefulness in combat
2) provide an alternative to tide turner
3) have demos charging a lot more, and charging is fun :)