I've never known anyone not to use lock washers in this application. But right here two fellas are putting them in that way without any problems. I use star lock washers also, internal stars usually, I have used external stars. I'd safety wire them if it were me, but I tend to over do things. It's my aviation maintenance background I guess.
I just replaced my clutch and removed the flywheel to have it resurfaced. The flywheel had been on the engine for 3 years and the bolts with no problems. Prior to that removal, the same set-up was used for 5 years without any problems. Loctite is just as good as a lock washer, but if a lock washer is called for, I always use one anyway.