How to customize toolbar for all users

We would like to pin the Accessibility Full Check to the toolbar for all our users. I have seen various references but none seem too easy.  Really -- I have to make my own GPO template? I was able to add it to my toolbar with a registry key as follows:

HKEY_CURRENT_USER\Software\Adobe\AdobeAcrobat\DC\AVGeneral\cAV2FavoritesCommandsDesktopand adding  reg_sz  a8 AccCheck:DoCheck.  I could use group policy to push this reg key but I am concerned about overwriting any customization they may have already have. I had 7 tools so I just made the Accessibility checker number 8 (a8) for my testing.  Would using a higher number work presuming most people would probably have 10 or less tools pinned...and therefore would not overwrite or if there is a gap in numbers (they only have 5 tools and I add it as tool 20) cause some sort of corruption?