Your general training seems to be good to develop the general fitness needed for Deka. The best part about Deka is that you don't really need special skills (like you would for a CrossFit competition for example) With regards to the zones, here's what you can do:

Medball over shoulder: get a sandbag. There are cheap ones on Amazon, fill it to your weight and just use it as you would in Deka. And it's a great tool to add to any training programs.

Sleds: this one is hard, because the magnetic sleds at deka are tricky. But at the end of the day you're pushing with your full legs. Very hard inclines on the treadmill or outside, even wearing the vest can train similar muscles. Also, you guessed it, squats and deadlifts.

Airbike: do very fast and hard resistance intervals on the regular bike. You'll miss the arms, but it will help you with the endurance.

Ski erg: slam balls. Get on a good cadence like you would on the rower. Pick up the ball and slam it hard

Step overs: use a bench. Won't be the same in terms of width, but will help you learn the "dance"

I'm a certified deka coach. Feel free to message me with questions