All EOS-1N and 1V cameras have the lockup in the custom function. Some later but lesser (non-pro) cameras do too, I find this is a good site for checking the custom functions of the various Canon EOS cameras, e.g. here for the 10S which has lockup plus a unique intervalometer function and the ability to use unperforated film:
Comparison of the 1, 1N, 3 and 1V:
I have the EOS 1N RS too which uses a pellicle mirror so no need for mirror lockup And 10fps drive.
If you want movements however, for the cost of a 24mm TSE you could easily get yourself into large format photography!