Change ProDOS Initial Programme

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Change ProDOS Initial Programme

As far as I remember things, ProDOS runs the first system file that it finds in sequence after the initial ProDOS bootstrap. Is there any way to change what it loads short of re-making a disk and choosing what was copied to the first blocks? 

 

What I want to accomplish, is to create a bootloader utility on an existing HDD volume, that lists the devices and slots; with an option to boot into GS/OS or to boot from another slot entirely.