Does the HHKB layout with regular printed ANSI keycaps have the original coloured pearl alphanumerics and pebble modifiers? Furthermore, are the alt and windows keys in the same position as those found on the HHKB (Windows next to space, alt where Windows key usually is)?
Yes you get the original full ANSI set if you order HHKB, so you can use it on another keyboard if you’d like. The HHKB caps are also included.
No, the HHKB positions will look approximately like this: https://www.modelfkeyboards.com/questions/question/are-there-any-photos-of-the-hhkb-layout/