I don't think a semi will give the same results
Though I'd unknowingly crashed a mk4 for a moment back there
Lucky escape by the looks of it. Hope you get better soon and up out of hospital. Was it just him and the tree? Or was there other cars / property involved. If so hope the following insurance battle goes ok too!
But for the purest engine experience, displacement has no replacement. All other methods are simply attempts to artificially recreate the benefits of displacement.