you should be able to track down a used engine, or even a rebuild for not as much as you think.
A competent MB tech, who does good work, should be sought out to give you an estimate to bring it back to life.
or potomac german auto, to name a couple of salvage yards you may find a good engine in.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.