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I helped migrate an application from a mainframe to a modern microservices architecture. I'm not sure what happened but they forgot or intentionally didn't include provisions to train end-users to move the front-end to a modern architecture (like an SPA) so we had to...reproduce terminal green screens in Angular.

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I had a very similar situation with a tax collection system written in Oracle Forms around 1999 that we rebuilt in ASP.NET Core. We had a bit more leeway than your project, but essentially we kept the navigation scheme and placement of the buttons and content panes in the app exactly the same.

The big upside of this whole thing is we were able to swap the database from Oracle 11g to MS-SQL with no impact on users. Something that just wasn't possible with the legacy tech.

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