Here is a file containing three scripts that all end up under the Layer menus.
Load a new File Linked Layer (loads up an image as a layer and sets
the layer name to "@FL@<full file path>".)
Reload All File Linked Layers (looks though all the layers for ones
where the name starts with the "@FL@" flag and reloads them.)
Reload File Linked Layer (reloads the active layer if it has the @FL@ flag.)
Right now it doesn't transfer layer masks, blend modes, or opacity to
the newly loaded layers, but that could be added if necessary.
Hope that does what you want!
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