If you're porting between two languages/frameworks with radically different approaches, preserving the original project's approach in the new code is going to give you something that's probably worse than the original!

Now when you hire someone new you're going to be looking for React experience but then having to re-train them to think in .NET, or looking for .NET experience but training them to write React... and any time you have dependency upgrades, you're gonna be fighting more impedance mismatches.

Most tech debt that slows down feature development has more to do with the code structure than with the language or framework, so if you're intent on preserving the structure and style I don't know that you should be doing a rewrite at all!