Most of the pages from Rainer Keuchel's site can be found on archive.org, including the page with the download links, but the download links themselves lead to a 404 error page. But the download page and the Windows CE software description pages don't include or reference MIPS versions of Tcl/Tk - Rainer says himself on the description page that he only wrote versions for the Jornada
(CE 2.11 SH3 for the 6xx and H/PC 2000 ARM for the 7xx
).
It looks like a MIPS CE 2.11 port was developed on sourceforge.net:
http://tclce.sourceforge.net/
- but again the download link for this version no longer seems to exist, even on archive.org.