My step through, which will be single speed freewheel, takes 27" wheels. I need a replacement fork and believe forks I found available (Fenix, Dimension, Sunlite) may be too heavy. Any good leads on aluminum 27" forks for a steel step through frame? Given my setup (Sunlite, Origin8, Star brake) I suppose a carbon fork would be too light.

Should mention the head tube takes a 1" steerer.

Do a 700c and a threadless conversion on it. Once you do that you can find a Carbon fork from Ritchey and possibly others in 1" threadless and easily find stems or shims for 1 1/8 threadless stems. However the bike might not be worth putting that sort of money into it judging by the components you mentioned. A 700c conversion probably wouldn't be as bad because you can find brakes and wheels fairly cheaply and there are 1" threaded forks maybe not light but cheap.

Here is an article that would help get you started:
https://velo-orange.blogspot.com/201...ake-reach.html

Honestly you might be better off considering a newer bike.

This. No need to keep throwing good money after bad.

This guy must be awesome to experience in person. 😂