I have created a version of the Phonemic Script Typewriter for US English.
Because of the different vowel sounds, I have had to use a different keyboard layout. I would be grateful for comments about how this can be improved.
I have also chosen not to use the rhoticized schwa (the one with the little hook) and I would also be glad to hear whether this is a good thing or not.
The link for this tool is http://mackichan.e-lang.co.uk/call/pronus/type.html.