Hi @Mohsauga,
As per my knowledge, SharePoint site URL is in fixed format and it does not support any manual or custom redirect yet. SharePoint redirect only happens internally and automatically when site address is changed.
I recommend you give suggestion in the feedback portal and help to make improvements. Many features of current products are designed and upgraded based on customers’ feedback. With requirements like this increase, the problem may well be released in the future. I will vote for you.
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