We have a wordpress site say www.example.com with more than 1k users. Now I wanted to enable subdomains to some premium category users, that is for who opted for their own subdomains. So that, if user enters u1.example.com should function similar to www.example.com
Wordpress multisite is one of the possibility but we don't want multisite architecture right now (as multisite will create separate database tables which is not in our scope) since all other different type of user allocations are already functioning and cannot be redesigned for time being and so is there any other ways to accomplish it?
EDIT: Some hooks or .htaccess file is more helpful.