Why hasn't any manufacturer brought out a misled gimmick for a pen?

I would buy one. or two

There isn't any need for it. There are pen thru bills on the market. With a little bit of thinking you can discover on your how to do the penetration of the bill with the gaffed pen where the bill is folded around the pen as done with the pencil in Misled.

Agreed with RS, the Misled gimmick offers a much more visual illusion than the Perfect PENetration trick. I think Danny Garcia has a pen thru dollar that looks something like Misled. Forgive me if I'm mistaken.

Cheers,
Fred

Although I don't have Misled, years ago I had bought (from eBay?) what I believe is a Misled type gimmick for a Bic style pen.

If you live near a casino that may still have coin operated slots grab one of the plastic coin buckets that are in stacks around the machines. You can make what you need and with a bit of well you know could form the gaff you need. then just make it match the pen you want to use. I really don't think there is a need to do it but you could.