Nice idea to use a wrapper, I can imagine that this is sufficient for many cases. However, please be aware that after the login, the logo in the top left part of the page will still be the one that is common to all accounts on the server.
However, please be aware that after the login, the logo in the top left part of the page will still be the one that is common to all accounts on the server.
With the advanced license it is possible to set a custom logo for resellers, but not changing it on the central login page 8443 main page OR accessing :8443 via resellers domain, which has to be included in the certificate).