I don't mind an alias of some form for the name of the manga, but it seems like the name you're proposing (リスカ変身サブカル✡メンヘラ) is the name that was used for the self-published tankobon (Vol 1 and Vol 2) and an English translation project for it. Otherwise, the name of the larger franchise and the original manga (Twitter, Pixiv), as well as its official republication (Amazon), is simply "Menhera-chan". I think that a utility alias (aliasing wrist-cut transformation etc. -> menhera-chan (ezaki bisko)) for searchability would be preferable over aliasing the whole character franchise to the first manga.
It's also not a good idea to manually create and populate the tags you want to alias something to before the alias goes through: supposing it doesn't, there now exist tags which have to be moved back. When you alias tags to non-existent ones, the traits of the old ones are migrated to the new ones. So if you alias a character to a brand new name, it'll show up as a blue tag on the BUR, but if the alias goes through, the new tag will be a character-type tag and will have the wiki of the old one.