Thank you all for your prompt and informative responses.

I'm going to size the chain long enough to handle the 52/34 combination thus eliminating the chance of accidental damage if I happen to shift into that combo.

I do use the 24/34 on a couple of hills that I frequent in my neighborhood. I'll be both practicing my shift technique to elliminate chain slack and shopping around for an original T.E. chain tensioner or a reasonable facsimile of one.

It's so nice to have a plan...