I always try to experience what the engineers were working towards.
(Before I go ahead, anyway, and Totally F**k things up.)
1.Break Away capability ? (So the engine goes UNDER the PC). Aluminum Arms
fulfill that function.So there MAY not be a Safety issue.
2.Vibration Reduction (that would be the Big Job for the mounts)
3.What effect on OTHER components would/will the change(s) affect?

The Urethane mods sacrifice comfort for longevity and stability....Maybe!

Hell,I've got a set of 186K MMs I'll sacrifice to the experiment
(Although,when and in what order they fall in priority is up for guesses.)

An almost Fluid,LOW Viscosity form of Urethane would be most advantageous...
If such a Urethane exists?

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'84 300SD sold
124.128