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Well, as usual, y'all have helped steer me in the right direction.

While I had checked the root .htaccess file, I later discovered a rogue .htaccess file inside /wp-content that was causing the problem. It was created and left behind by a security plugin I tested (and deactivated) a while back that, wait for it...prohibited execution of .php files where they aren't expected – like the SP CSS.

So technically, this was never an issue of CloudFlare not playing nice after all, at least not yet. Still testing that theory. Now that I have the stylesheet issue resolved, I can get back to testing.

Thanks again for the excellent support!