Power Valve Restrictor Channel Tuning

Good Afternoon.

I have a proform race carb and a wideband 02 sensor. I am going to dial in the jetting for lean cruise and WOT. I would like to be able to enrich the power valve circuit more and Proform and other billet metering block style carbs have screw in jets so that you can adjust how much it enriches. My understanding are that these are 6-32 air bleeds.

My problem is I can not find different size jets for it anywhere. I can find small idle air bleeds but nothing in the diameter that you would use for power valve restrictors. I can find screw in blanks that you can drill but boy that would be some awful small drilling.

Any ideas on this would be appreciated.

Thank you