Don't get me wrong, I'm a fan of the 3000e series - I chose to go the 3038e route myself and have been very happy with mine!
That being said, some concerns would be that I don't know what a subframe might do to ground clearance or how hard it would be to mount & dismount it and the BH. I generally use the 3038e with something hanging on the 3PTH, so I couldn't leave a BH on there for any period of time.
If I regularly had tasks that needed a BH, I think I'd probably lean towards using the same money towards getting an older, used item that was purpose built for backhoe work & leaving the 3038e available for other tasks - or rent one for a short term need.
Nick