Thanks to forsakendown for starting this poll! We've contacted the vendor on your behalf and they've made the Fisher Bullet Space Pen (2-Pack) available.
I have had all of these pens. The Lamy is nice, but it is expensive to keep, and doesn't write as reliably as the Fisher pens. The old-style fisher pen (without stylus) is slightly more likely to fall out of your pocket. I started using pocket pens ~35 years ago with the first Fisher Space Pens, and I have lost 5-6 of them (and I usually never lose ANYTHING), so don't under-estimate the importance of even the slightest slip resistance.
I'd love to have a keychain version of the space pen since my experience has been similar to yours. I pretty much never lose stuff but the space pen has a way of wandering out of your pocket.