Can you please add the feature to reseller to be able to install the CA_certificate because this is really bad if you don't for reseller and could result of lost of customers because some browser doesn't support Website without CA_certificate and will generate an error "Invalid Certificate Authority" or "Invalid SSL"
Or you could protect our full domain with LE's Wildcard, I am also curios on why you protected only the vPanel but not the whole reseller's website.