There is no problem in getting any car over the Bealach Na Bá in the summer - 4 wheel drive not required. (Hint - the clue is in my username)
The big problem is that it is a single track road with blind bends, and the publicity around the North 500 has made it far too popular - to the extent that the road cannot handle the amount of tourist traffic. There are warning signs at the start of the road about unsuitable vehicles, but tourists sometimes ignore these, and two campervans not knowing the rules about passing places and meeting head on makes for interesting driving.
The Applecross Inn deserves its good reputation, but I have not been there this year, and there may be problems with the Covid-19 restrictions - the inside layout might be difficult for social distancing and sitting outside is at the mercy of the weather. (Hint - it sometimes rains on the West Coast, and when it does not rain there are midges. Fresh tourist blood is a delicacy)