All you probably need are a spare bolt or two, firing pin springs, and mainspring. As for ammo, all I've shot is pre-1940 german and czech, and while I have yugo and romy I haven't broken into the new stuff like that. Yes, stay away from the turk. I've not seen some of the others you mentioned, but if I had none, I'd start with the romy and if not available maybe try the PPU. If you see any ammo that fails to fire one round out of a bolt rifle, odds are it will never run in a 34.
I have several of the armorers tool kits, and while cool, they are not necessary for the most part unless you are going to tear it way down or need to adjust your patronentrommel 34 tension, which very few of us have, and fewer adjust. Spare 34 parts are everywhere and if you did break something it's no problem finding it, and they are currently making more so there is no shortage.
You're going to see tons of stories about guys switching bolts/ barrels and all kinds of other parts to get their guns going. It's not that complicated, buy good parts and good ammo and problems will be minimized. Swapping out 6 bolts/ barrel combos with bad firing pin springs and shot out barrels, crappy ammo until you find the combination that works.....and it only works that day is funny to read about, but it's very common and why the gun has lost popularity over the years to the MG42 which is indeed more user friendly. When you do get advice 80% will be from the semi 34 owners who have never had a gun that would strip the first round from a belt and fire.....ever, but they will tell you they got their guns going really well by doing........again 6 different combos of stuff. HTH