Need help with Sandevistan homebrew I'm working on

I really like the way speedware was portrayed in Edgerunners and 2077, and I feel like the sandies we get in RED are kinda lame compared to them, and don't really give a satisfying bonus imo.

I've been thinking about how I could change the mechanics of it to give the user the cool super speed powers, while still keeping this piece of chrome rare and very dangerous.

So, my idea was, the sandevistan no longer has any effect on initiative. Instead, there are 5 tiers of them which have different qualities, effectiveness, and rarity. Depending on the tier of sandie you have installed, you'd get 1-5 "action points" which can be used to:

A- double MOVE for each point spent for 1 round

B- double ROF per point spent for 1 round

C- A mix of both, for higher tiered pieces

These effects can only be used safely once a day, if you try to push it, you risk serious harm in the form of 1-5d6 damage directly to your health, depending on the tier, for each extra use.

I also want to impose a stat requirement for BODY or REF, as well as making the chrome itself insanely expensive.

What do you guys think? I still want the game to be balanced and challenging for my players, but I want to make the sandie a cooler toy to play with as well. To that end, what do you think I should change to make this more fair?