Earlier quoted context omitted.
There are not one-off since I'd have to perform them every time.
Every time? I'm confused. How frequently are you setting up new blogs? If it IS frequent, why have you not automated the process?
I am frequently setting up new services for try out which are not blogs (e.g.: vpn, online bookmarks manager, chat services, file syncing services, etc.). These require different setting in the reverse proxy and a different subdomain.