I don't get your problem, there is a 64 bit flash player. I wrote a script that should work everywhere with wget or curl installed - if you find a system without those tools tell me:

http://kanotix.com/files/install-flash-local.sh

Be sure to uninstall every opensource flash player before. Run the script only as user NOT as root. Btw. Ubuntu 64 bit is really STUPID. There still nspluginwrapper is used while it is not needed since over 1 year!