By ".22 converter", do you mean a .22 LR conversion kit for the Glock 17 (9mm)?
If so, I believe you can. I run a .22 LR conversion kit on my Glock 22 (40 S&W) / Gen 3 and it works just fine.
However, I don't know if you can use a .22 LR conversion kit on a Glock 17 "Blank Gun"? It doesn't seem logical that me that you would be able to, as using a .22 LR conversion kit on a blank gun would allow a person to "skirt" some gun laws.