Looking for someone who can machine a torx t20 slot into a knife pivot for me.

Anyone here know anyone that can help me out?

I'm a machinist. If I understand what you're looking to do, about the only way you're going to sink a torx wrench key slot into a part is with an EDM die sinking machine.

You'll have to call around your area to find a shop with a stick EDM.  It will be expensive.

A more affordable alternative, if possible for the part you want, would be to buy a T20 bolt and have it machined to fit your need.

In other words, start with a T20 bolt and work backwards towards your finished part. Conventional machining methods (milling/turning) are cheaper and more readily available than EDM.