My first thought would be to try to challenge these requirements and make sure it is indeed required by the end user because implementing it will be far from ideal.
However, If you want to accomplish this with only out of the box Jira features, you could do as follows :
I would not recommend this solution as it could require a lot of manual configuration work (if you have many workflows in that project ) and can make changing things or troubleshooting issues more difficult.
Hope this helps.
PS: tested on Jira SW Server 8.4
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