By the way, I checked the source and it appears that setting SSLStaplingStandardCacheTimeout to a large value (larger than typical OCSP reply validity) effectiv

By the way, I checked the source and it appears that setting SSLStaplingStandardCacheTimeout to a large value (larger than typical OCSP reply validity) effectively creates this behavior. Apache checks if cached reply is still valid and if it's not it attempts to renew it. At least in 2.4.10 shipped in Debian Jessie. Relevant code is in modules/ssl/ssl_util_stapling.c, stapling_cb()