1 Make sure you don't install them
2 Install them into a different folder hierarchy and do not include that folder in the VST paths
3 In the FX Browser, edit the name to add a leading # and de4slect that Show option in the FX Browser context menu.
You may run into problems (solvable, often by editing the project file to change the plug-in name) if your projects are currently using the 32-bit plug-ins.
And, no squabbling yet