One possible solution is Red Giant Software's new free LUT Buddy. This allows you to read a LUT in certain formats and then apply that in apps like FCP and After Effects. It does this by applying an instance of LUT Buddy as a filter and then reading the LUT profile. I'm not 100% sure whether it can take any LUT or has to be used at the creation end as well, but it's worth a try.
- Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com