Non-Audiophile Audiophile question!

I've a pair of my 'bookshelf' Walsh that work great near-field, so I can recommend the Ohm version that you might try....

Mate them with a small sub and you'd be good to go.... ;)

Not a good idea. 

Get a pair of Hifiman Sundara planar mag headphones instead or something higher up on the Hifiman chain.

I agree that it should not matter that much.  As a matter of fact would be a good way to compare speakers.  Take the visual out of the process.   Good luck.  

Omni like Ohm - larger and much more forgiving sweet spot.

Just for the record, standard OHM Walsh CLS driver configuration is NOT Omni.

But it does have carefully controlled (by design) 360 degree dispersion. Output in wall facing directions is more highly attenuated which allows for better performance in most rooms placed relatively close to walls. Omnis and bipolar designs like Magnepan require more distance to walls for best results. Of course distance from walls also negatively impacts bass levels.

So there is still really nothing else like them either in design or the sound that you hear.