Best idea is to leave the car outside overnight and put it in neutral/park and start it. If you listen under the gearbox/flywheel area (get someone to start it for you ) you should hear a "can of marbles" rattling type sound for a while... That's the best way to tell you have a dead DMF... All it is is that the spring in the DMF wears out/breaks and rattles like nothing else... But generally only makes itself really known on a cold start on a cold morning.

If you search YouTube for "can of marbles dual mass flywheel" I'm sure there will be clips of the noise.

Good news is that if you ring ASV Spares in brookvale you should be able to get the genuine Sachs parts for under 1k...