How to allow potential clients to preview a theme

I have several themes installed in a WordPress network.

New clients will receive a network sub-site.

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I’d like them to be able to preview the available themes that are installed in WordPress.

There are a handful of plugins that claim to allow this to happen, but none of them have been updated in the last couple of years.

Do such plugins not work in the recent versions of WordPress?

Is it possible to create some code myself which will achieve the same effect as a plugin?

Thank you.

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