I've made a plugin that does the opposite, but manually, and supposedly does not work with swing doors. I've only tested it in TFC and I was able to change the health of a sentry and even found a map with breakable glass which I was able to change health with, too. So, feel free to experiment with it. All changes you make will be stored, to load them put "amx_ent_get" into "addons\amxmodx\configs\maps\mapname.cfg" . Actually you might simply use "listenserver.cfg" or "server.cfg" depending on what kind of server you run, because the last version I made takes the map name into account.
http://forums.alliedmods.net/showthr...=114925#119111
You need to install the vaultx module from the module section of this forum.