Johann Nepomuk Holzhey was a renowned late baroque organ builder who built about 40 organs, 4 of them with three keybeds. One of the latter can be found at Weissenau Abbey. Prospectum offers a sample set which is one of my absolute favourites. At the moment, the standard version is available for about 199 €, and IMO it's well worth it.
Currently it is available for Hauptwerk, but not for GrandOrgue. In this repository you'll find an organ definition file (ODF) and additional files so you can use the sample set with Grand Orgue.
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Purchase and install the sample set using Hauptwerk as usual.
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Download and install GrandOrgue (version 3.14 or later is required).
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Download the files of this repository.
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Locate the folder »000460«. Move the downloaded files adjacent to this folder, resulting in the following structure:
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000460
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GrandOrgue
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Weissenau - Holzhey (1787).organ
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Ensure your MIDI keyboard is connected to your computer.
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Start GrandOrgue
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Press the key »O« and select the file »Weissenau - Holzhey (1787).organ«. The Weissenau sample set will be loaded.
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Hold the Ctrl key and klick on one of the keybeds. Klick on the button »Wait for Event«, press a key on your keyboard and confirm the dialog.
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Press the key »S« on the keyboard to save the settings.
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Open some of the panels (e.g. the Cockpit) to figure out which one suits your needs best.
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Enjoy :) .