Thanks, mklotz.
A frequent issue in woodworking is to raise the height of the piece you are working on to make some works (woodcarvings, cutting dovetail joints, etc.) more comfortable, and at the same time provide several ways to hold the workpiece. Many of these accessories include a Moxon vise. Here are some examples of benchtop benches, and here is my version of a benchtop bench with Moxon vise.
Perhaps you could use a wood riser where you would anchor your metal clamping devices.