Too bad you don't have the Z1R to run it with the Elise. I think it's a great combo. It runs against conventional wisdom to pair a headphone with a warmer sound signature with a tube amp but I think the Elise is on par with the Sony TA ZH1ES, at least for my turntable set up. I might be returning the TA actually. That's how good the Elise is.
Yes I would like to see how the Z1R sounds on the elise. Though I do have to wonder - I've heard that the Elise works nicely with lower impedance cans as well, but with an output Z of around 40 the damping factor would definitely be something to consider. I'll probably measure when I've the time, but so far have you heard any characteristic problems of an impedance mismatch with the Z1R?
Also, I didn't quite get around to a full-on review of the TA-ZH1ES, but I do find that a multibit DAC with the Elise made a far more lasting impression than the Sony DAC/Amp. Sort of smooths out the characteristic exaggerated sound of multibit. The result being, excellent. Not to come to a sweeping generalization, but FPGA sound hasn't always worked for me.