Here's my Joe Strummer Tele. I have a Fender grooved steel for B/E and Wilkinson's tilt compensated for the others. I didn't like the "relic'd" threaded steel that came with the Joe Strummer for two reasons;
1) It felt like the string might be hanging up on the relic rust... it was breaking strings. the grooved steel seemed to reduce breakage.
2) Invariably I'd get the string in the wrong thread and have to drop tension and move it.
After I got the new guitar I dropped tuned this one to CACGBE with heavier gauge strings.. I didn't like the intonation of the straight saddles, hence the tilt compensated saddles. It's back in regular tuning now with light gauge strings.
I don't think you're going to cut through a "genuine Fender" steel saddle. Or any real steel saddle for that matter.
The graphtecs work for some people. for that matter brass works for some people. Since you really only need B/E (if indeed you have a 3 saddle bridge) you can mix and match if you'd like. I'd recommend something with a groove, thread or slot so the string doesn't move around. Have at it and let us know how it goes.