This is precisely what we did with my MkIII. The first cut was flat brackets that sandwiched between the chassis- and engine/gearbox-side of the rear mount, glued together with a welded-in square tube. It worked great until it busted because we couldn't reach inside to get full perimeter welds done.
The current iteration is a link about 4" long, with rod ends connecting the front of the engine - off of a boss down by the starter(?) - to a big ol' bracket welded to the subframe. It essentially binds up the flexibility in the front mount.
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