Unfortunately, we do not have a testing environment for Blizz. Nevertheless. most of the problems that you mention should be solved by using the web client (for participants) which will be availalbe worldwide within the next couple of weeks.
Regarding the remote changes of the own Blizz settings, as you may understand due to privacy restrictions, these settings can only be changed by the participants themselves. With this or any other software to remotely assist your colleagues with the installation you will need to use an additional tool, like TeamViewer.
We hope this information has been helpful and wish you a lovely Monday.