I don't think you can do this without a macro. You can use a macrobutton field to run a generic macro and include the modifier key handler in that macro. A macrobutton field means you need to double-click the entry rather than (Ctrl+)Click the hyperlink. You will also need to ensure that macros can run in the file.

Probably the easiest way to manage the the two hyperlink addresses is to bookmark the macrobutton and have the macro marry up the bookmark name with the two path possibilities.

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Andrew Lockton
Chrysalis Design, Melbourne Australia