" Some say that I can download an iWork '09 trial, but it is 32-bit. "
Not a useful choice, even if you can install it.
The trial period is 30 days. I've forgotten what limitations applied to the trial version, but as I recall, they made it not useful for continued use. Likely had to do with printing, saving documents or both.
When the trial period ends, or to activate all features, you'd need a registration code. The servers providing those codes are no longer active. And even if you were able to acquire such a code, the servers that recognize and validate the code are also no longer active.
You may be able to find the retail boxed dvd version of iWork '09 from one of the Apple resellers. This version required no unlocking code, but did, of course, require the computer to be attached to a disk drive capable of reading the DVD.
Whether the '09 versions of Pages, Numbers and Keynote will run in Catalina is another question—one that I don'tknow the answer to.
Regards,
Barry