AF_Blue,
You don't need a gunsmith to remove that flash suppressor. All the hard work is done. Clamp the barrel and use an appropriate size wrench to remove the FS and slide off the washers. Install the new washer, screw on the FS back on and tighten as needed. Just be careful when you are approaching the final index point. I just do that by eyeball.
I'm looking at the thickness of the three washers compared to the thickness of the FS collar they butt up against. I don't see any reason why a crush washer won't index the FH properly as your barrel externally appears fine (I have crush washers on all my rifles).
There is a remote possibility the barrel end was turned town a few 1000ths, but I wouldn't really be able to tell without a better pic, or looking at it in person.
If that's the case, just use one of those three washers to shim it behind the crush washer. It'll still be better looking than that lash up. I reused a crush washer like this for a short term fix before, and I'll post a pic of it to show you what I mean.
Jim