Try this. Unzip and put the ZSC file in the ZBrush 4R8\ZStartup\ZPlugs64 folder. Restart ZBrush and you should have a new sub-palette called “Set Boolean” in the Zplugin palette.
The “Process Subtools” button will run through the subtools and set them according to your labels. It will ignore case so “union” or “UNION” will both be set.
I included a switch called “Clr” in case it is useful. If this is turned on then any subtools that are set but are without your labels will be reset to addition (as the default). For example, if you have a subtool called “Orange_base” which is set to “START” then this will be turned off and set to addition.
Code is in the zip.