Actually, supporting keka frontend with 64bit doesn't affect performance issue.
But internal CLI biniries are critical.
0.1.2 latest version just have 32bit binaries only.
I would like you to add 64bit support in it.
I attached some modified version of p7zip.
It has 32bit and 64bit both, but 32bit is compatible with 10.4 later and 64bit is 10.5 later ( it use some Unicode normalization and libiconv encoding conversion )
You can visit my blogs to see modified version of CleanArchiver. : )