How to conditionally include/exclude UFUNCTION based on engine version, without repeating code?

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I have a released plugin that currently supports 5.0, 5.1, and 5.2, and exposes blueprint functions that use double parameters.

I have a very reasonable request from a potential customer to backport my plugin to support 4.27. I think to myself, “no prob, I’ll just conditionally compile out the UFUNCTIONs that use double if ENGINE_MAJOR_VERSION is less than 5.”

Except that doesn’t work. UHT doesn’t like UFUNCTIONs inside conditional compilation blocks.

So…

How do I make my plugin code base support both 4.27 and 5.x in this case, without creating duplicate plugin code to maintain?

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The life is tough.