Hey Brian, really glad to hear you’re hooked on the Morph! I replied to you privately on support but wanted to reach out here as well so everyone could see.
There are no plans for a larger Morph at the moment, but it’s good for us to know this would be useful for you.
This doesn’t help with larger key areas, but you could get multiple morphs and set them at different octaves. Here’s an example from the forum, in which @NothanUmber built his own Continuano.