Re: ditch the Apple
It seems to me that you could get close to the phone you want if Moto's Mod system was open to other phone vendors, thus attracting more 3rd party developers of hardware attachments.
It is better to have a physical keyboard as replaceable component - it can be swapped out if a key fails. The Moto MOD system phones have a small array of recessed plates, which can shunt power (both ways) and data between the phone an add-on such as a battery pack, loud speaker, zoom camera or projector. When attached, these add-ons look incorporated into the phone.
There is no engineering reason that a good physical keyboard - QWERTY or BlackBerry style - wouldn't work well with such a system.