I have owned the D7000s, D5000s, and APSv3 recabled MD2000s. I prefered the D7000s over all and feel there is a significant jump in overall refinement of the sound quality with the D7000s, and the bass in particular was the best of the bunch. It is not boomy at all in my opinion, but that is exactly how I would describe what I heard in the D5000s. The bass of the MD2000s was good, but not as good as the D7000s. The bass sounded more damped, sort of deadened in comparison, whereas with the D7000s, I find it to be more controlled, detailed, and textured.
Regardless, the Denon sound signature features a full, prominent lower end. If I were you, I would try a reversible version of the mods that are out there on your D7000s or look elsewhere. My guess is that you should try something else. You will likely lose a bit of money on the sale of the D7000s and then have to pay for a pair of D2000s and get the extra cable and still need to do some modding. If it ends up not to your liking, which would be my guess, then you will need to sell the D2000s at a bit of a loss. Maybe safer to try a different manufacturer.
I have regularly encountered headphones that I have liked very much except for one feature which has ended up being a deal-breaker. It is a bummer for sure, but you may want to keep hunting. There are lots of flavors out there and there is likely one that fits the bill for you just perfectly. Climbing down the Denon line-up where the lower models are notorious for their boomy bass seems an unwise move to me.
On the side, since it was mentioned, I have yet to see a solid official piece of evidence that states any of the Denon drivers are exactly the same. One thing for sure is that Denon markets the D7000 as using stronger magnets in the driver casing. My take on it is that the D2000/D5000s have insufficiently strong magnets to control the drivers, thus the boomy bass. The mods address the issue by damping it, but the improvements I notice in the D7000s result from better controlled drivers and the results are of higher quality, not just with the bass, but the whole sound signature. That is just speculation but the D7000s are not just D5000s with newly polished cups and a fancier cable.