The one on the small wheel ( crown wheel) is reverse threaded, opens in anticlock direction.
I would mix WD 40 and the oil you got to, apply generously and give at least 24hrs for the solution to penetrate.
Is this your first victim? If so, perhaps we should practice on some cheap movement first.
I just searched ebay everyday until the parts were available. This type of dial is very difficult to find. I started with a case then I found the dial that fit that case and then find a movement that will fit the case. If it doesnt fiT then just make it fit. Saw, grind, file, paint, whatever u need to do to make it fit.
I've tested all screws and they are all sufficiently loose enough to undo them except for the three stated. I've tried to reverse the three but am worried I will either tighten them more or break something. I'm reuploaded the image with the screws in particular circled in red and the good ones in green. I really hope that loctite is not the case...