Yeah that would likely be a problem. You'd have a 1 1/8th" headset but probably no mounts for a rear disc brake. BB shouldn't be a problem though.
If you can't get the Yeti but want something of that era in Steel, then how about an Independent Fabrications? You could even get them to build something to replicate your original FRO.
MBI did a head to head test of the ARC with the IF Steel Deluxe (again, back in the day). The review was glowing about both bikes, but what it didn't say was that the tester loved the IF so much, he actually bought it.