I will direct your attention to www.phenomenalog.dk
It offers an extremely user-adaptable multi-purpose freeware digital diary and journaling tool-set, which I have been continuously developing and using over more than a decade.
I suggest, that you consider it from two different angles: a) as a convenient tool for product-testing and b) as an independent living product in itself, relevant across a broad spectrum of target-groups.
The present version 19.7.5 represents as far, as I have been able to develop it myself. There are aspects for which I need feedback from users with various disabilities and handicaps, - relating to a special feature: the development of pictograms as one-click shorthand for everyday typicalities. They may supply ideas (perhaps even design-ideas) relating to types of symptoms, treatments, pains and use of other disability-tools.
I have been following bespoken a long time, much impressed by your ambitious enterprise, and hope you can help announcing this tool across the many relevant target-groups.
I am open to dialogue through kresten.bjerg@psy.ku.dk