I initially liked O'Rourke for just that reason (dreamy, a la Chopin, and with the benefit of the exceptionally clear Chandos recording quality). The O'Connor recording I found typical of certain Telarc discs (to my ears at least), resonant and boomy, though the interpretation was thoughtful.
However, I agree that a less sentimental approach has its merit. Another version that may be available is on the ARTS label (German) with the Italian pianist Pietro Spada, who went on to record allof Field's solo piano works ('The Field Edition'

. They were available for a time at Tower for mid-price ($9.99). While I do not own this version, I own Spada's traversal of the four Field sonatas, and two additional discs from the cycle with assorted pieces. Top-flight playing and digital recording.
The piano version I own and enjoy is one by Hans Kann, who I think recorded a bit of forgotten romantic piano concertos for Vox Box. I would characterize Kann's interpretation as direct but not rushed. Unlike O'Rourke, he manages to fit all 18 nocturnes onto one ADD CD (74:25), issued on the Swiss, Tuxedo Music label, in 1990 (Tuxcd1056). I bought it online in the late 1990s, but perhaps it is already oop. Hope this helps. Regards. Glen