I've ported http://www.codeproject.com/KB/DLL/CreateYourProxyDLLs.aspx to MIPS / Win CE, it's quite useful, at least if you know how to 'replace' your target dll - there are a few ways to do this, i.e. by replacing the file in the nk.bin (anyone interested in fixing xipbin ?) or by hooking the wince filesys api / loadlibary and returning your file / dll handle (been there, done that, new release soon, at least i hope so).
Requirements: vs2005, windows ce 5.0 standard sdk
DL here : http://www.t-hack.com/wiki/images/c/c8/Wrappit.zip