If you want to replace this template generally for your siteaccess, you can just put the override in such an folder: design/<your siteaccess>/override/templates/notification/handler/ezsubtree/view/plain.tpl.
I don't think that dynamic overrides are possible for this template.
Hmm, in this case I don't know either what to do. Usually it is enough to place the override templates in the corresponding folder on the custom design folder for your siteaccess if you don't want or have any specific override conditions. So if that does not work either I don't see any other option then to replace the original template.
Claudia
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