Yup learn the keyboard – and continue to do so – there will always be a getting better. I agree TonyDS. And i have been – here’s my scattered thoughts on doing that.
But on the other hand – there is plenty of room for all these sorts of alternatives too. And i like to remember that some great song writers had very limited keyboard skils. Irving Berlin as for instance only played in F#. (You might have thought the one key to learn would be C, but F#, the black key inverse world of C makes an awful lot of sense.)
And Irving Berlin used the mechanical version of something that fits this thread – a transposing piano. Check out this (1 minute and 20 second) corny video if you’re interested.