Putting a spell on a stick is tricky business since it is very easy to overshadow the spell itself.
Given the skill and casting cost mirror the spells themselves, I think that might be the case here.
... What if insead of giving the creature accelerate / overdrive, it just gave them +2|-1(+3|-1) and prevented skill use for 1 turn. Maybe reduce skill cost to compensate as well
e.g.
"
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
Accelerate: Target creature gains +2|-1 but may not use any skills for 1 turn"