Is there a way to block Swedish letters when creating an user account with a template?

Is there a way to block Swedish letters when creating an user account with a template?

I'm using templates in AD Manager Plus to create user accounts and we are using "UMLAUT" to replace Swedish letters from UPN, E-mails and other attributes. (Marked with red lines, see picture.) But the First and Last name will keep the Swedish letter. (å, ä and ö)

Is there a way to block these letters already in the First and Last name attribute instead of having "UMLAUT" on naming rules on UPN and E-mail attributes?

In short, I want to block Swedish letters in Firs and Last name. (Marked with a cirkle, see picture.)

/Fredrik
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