If you can find out the Ellipse's ERD (effective rim diameter) then you could buy a rim with the same ERD and lace them up.

ERD of various rims with 30mm depth:

Veeps - 582
Weinmann DP18 - 581
Rigida DP18 - 581
KinLin XRP-300 - 577
IRD Cadence Aero - 576
Mavic CXP30 - 587
DT Swiss RR 585 - 582
Alex SUB - 579.6
Alex G6000 - 580.3