i have had several halti's (different sizes because none of them ever fitted comfortably), the gentle leader (ok but bit fidly to get on), and found all of them a pain to be honest one way or another. I also found eye squishing an issue
then whilst at a car boot, saw a lady walking round with a georgous black working cocker, not pulling, with what turned out to be a very simple contraption, that didn't look odd or uncomfortable, didn't dig in anywhere! eyes not at all affected!
it turned out to be a soft slip lead, but put on in a figure of eight so it looped round the nose, and if the dog pulled, it would pull from up behind the neck/head. makes complete sense when you see it done this way. I've never looked back, nor has me mum who got the same for her poodle cross. It's totally un fiddly to put on which is great when you've got three dogs, and Jazzy is more than happy walking with it like this, so's my arm.