You don't really need a forge or much in the way of blacksmithing skills to use Kaseknit. You DO need a large hot fire that you can keep going for several hours and some kind of crucible to put the frizzen and the Kaseknit in. If you know somebody who has a furnace that burns coal, that makes a good heat source... cast iron wood stove will work too.
Probably easier to learn the rudiments of 'smithing, get a cheap Amazon forge and forge a spring steel frizzen. Expect a high scrap ratio until you get the hang of things. You might be able to fashion one out of an old leaf spring.
I've got an old T/C Renegade flinter. So far have not noticed any issues. Don't really expect any during what remains of my life.