What's a programmable keyboard with a split spacebar design? I wanna remap the left spacebar to ALT.
I think it's going to be hard to find a split keyboard like that, unless you want to go for an Ergodox. But then, with the Ergodox, it's... a pretty high investment keyboard. Not only do you have to pay a lot for it, but then you have to wait for manufacturing, shipping, and then you have to assemble it, which also takes time.
EDIT: Though to be fair, I quite love my Ergodox, and I think it was well worth it.
I agree on the Ergodox if you're fine with a different layout and are not afraid of a ~$200 price point. I also think mine is a great keyboard (bonus, you can do exactly what you want with any key)
I'd suggest Ergodox EZ if you're fine with gaterons (most gateron colors available), ready-to-use, and feeling like a professional product. It's shipping apparently in two weeks
You can also consider Truly Ergonomic
Or µTron, although this one is both really expensive (~$400) and really hard to find (I've seen some in Tokyo, but I'm not sure I've ever found them online...)
It seems staggered, btw, but the staggering is symmetric, which makes a bit more sense.
With more classic layouts, you can look into
- Cougar 700K (normal keyboard with Cherry but split spacebar)
- Z70 (65% keyboard, but you'll need to find a drop)
- Clueboard (65% keyboard, the split spacebar is an option, again it'll be a drop)
- TheVan (40% keyboard, again may be hard to get)
There's probably others (well, you can always go Maltron

). Good hunt.
Edit : Damn, I missed the programmable part. Ergodox is fully programmable. Truly Ergonomic can be mapped as you wished. Clueboard and TheVan too I think. Not sure for Cougar and µTron, but in any case, you can often put a "programmable dongle" between the keyboard and the PC, and get everything you want, including controlling mouse with the keyboard.
https://geekhack.org/index.php?topic=72052.0
This... thing... add tmk Firmware support to any keyboard, even 30 years old ones (there's different versions). tmk is a great firmware that allow pretty much anything. You may only loose some media keys on some keyboards and pointing devices, since they're not sending standardized informations, unless you're ready to code this part.
Haha. No. Mechanical keyboards are a drug. You will buy dozens of keyboards
Go ergonomic... That's a cure, since there is so few of them, you can't start collecting them
