[verisimilidude]

I used a Kinesis Freestyle (1st edition) for five or six years before building an Ergodox. If you're having trouble with certain chords, qihqi's suggestion is really the way to go: you need to train yourself to use both hands. I thought I would like having modifier keys on the thumb cluster of the Ergodox, but ultimately found it very uncomfortable. So learning to two-hand basic chords on a split keyboard will help you out regardless which specific keyboard or key layout you eventually use.

[scribu]

Thanks for sharing your experience with Ergodox.

Usually, I want to press Cmd + T when I'm in the browser, so my right hand is usually on the mouse. That's why I want to do it with a single hand.

(I've tried browser plugins that mimic Vim keybindings, but I still need to reach for the mouse a lot: browsing menus, etc.)