By Difference between, Idiolect

Hwat for what is the original pronunciation and was the only form used in Middle English. In Modern English, many dialects lost the wine-whine distinction, and began pronouncing words spelled "wh" as simply "w", rather thn "hw". The original, conservative form is still around, and is considered...

In my idiolect, the inversion is obligatory. There just may be speakers who accept it without the inversion. Both your sentences are "Second Conditional", so I'm not following the rest of the question very well. "could" neutralizes the difference between "were able to" and "would be able to". ...