Keymaps for Treo or other PDA cell phone?

Hey y'all,
Has anybody out there managed to find a PDA cell phone, like a Treo  
755 or newer, from any provider, that supports Dvorak keymaps? I know  
there was a keymap for the old Handsprings, and I think there was one  
for Palm, but everything's a cell phone nowadays.

I got email about this from someone, and I don't know what to tell  
them. I guess they're using an external folding keyboard like the  
Stowaway or somesuch, or they've got really tiny fingers. (I can't  
imagine touch typing on the phone itself, but I am a little ham-fisted.)

I'd appreciate any suggestions; well, any I'm likely to get from this  
group.
Cheers,
Marcus