Chicony 5181 has Alps-compatible key caps ... You mean Chicony 5191?
I have a set of new double-shot beige/grey key caps, with a "big-ass" backwards L-shaped Enter key, etc. that I think could once have been made by Chicony, but it is a bit special. It has a small left Shift like ISO boards, and a blank key next to it. The Enter key might be a bit unusual, too. I don't have time to check it today, will have to get back tomorrow.