Password change option while Creating VM from custom VHD

I have a sample custom VHD with OS and other software loaded in it along with a couple of users setup as a workgroup.

When I create a new VM in Azure with this custom VHD upload, I require the user to change the password since he would not know the actual passwords within the VHD. I would give a drop down to select from a list of users and change the password so that when the VM is created, the user can directly use this newly created password to login to the VM and start using the application from the vhd.

It would be great if the newly created password is applicable for all users.

Thanks,

Hoysala