I think that one thread about alternative accounts is enough. It is also possible to draw up reports on violations of the ban evasion. In the message to the moderator, simply add a link to the report.
I know a similar thread in the Russian local department. If you submit reports in a simple format, the moderators always react very quickly and the offender is instantly banned.

We already have it here [Report] Ban Evasion [Requesting Admin/mod to check those and ban], it seems that thread doesn't active like Known Alts of any-one created by Timelord2067

But well, we can still use it.