Will there be downloadable PDFs of the errata cards for key positions and rapid reinforcements? I don’t like having to refer to the rulebook to vet the correct wording when playing. I’d like to have the correct wording on the table.

As far as I know there isn't. But you could just copy the image from those cards from the rulebook and print them if you want.

The Rules Reference Guide is a PDF...

Yes, but to print the card from the rules reference, I have to print at 200%. It doesn’t look good.

I’d like one that I don’t have to scale.