OD Home without changing AD Home location

Here is my situation. I need to have users when they login to a Mac client machine (10.4.11) bound to both AD and OD, authenticate to the AD and then pull the network home from OD. I know this can be accomplished by changing the AD accounts home path. The issue is that the students will need to have their AD homes as well. The OD homes will only be used when in the Mac Lab. I know we could just have the OD separate from the AD but then we end up with different passwords and getting students to remember one is sometimes difficult. With the machines bound to AD and OD we could have the AD home mount as a share so the students could get to that storage also. Looking for suggestions on how best to handle this. 10.4.11 OD server. Thanks, Eric H