Thank you both for your responses. Unfortunately, how to reinstate my apps remains a mystery. My formal Google appeal remains unanswered.
To Asales: I logged in, selected one of my apps, selected "Store Presemce", "Prices & Distribution" and checked the "It has no ads" option but the "Primary Child-Directed" options remain disabled.
To Jack Cole: I went to "Store Listing", then to "App Content". There, I found all the original entries still present (including the original icons).
Attempts to resubmit failed.