I provide certain data entry services such as manual typing of text locked into images and WordPress CMS data entry. Please visit my site for complete details how can I be of help.
I haven't done that but I feel like it won't be sustainable or fast enough, you'll need to use a full fledged computer [desktop/laptop].
But if you're adding a keyboard and able to switch between apps easily like we do on MacOS [haven't used iPad Pro] then probably that difference should be further slim. Sounds interesting as I think of it, you should definitely try & tretch/test the limits. Good luck :)
I like your site's interface, the boxes in All Jobs section gives a bird's eye-view of many things, specially the Jr.DevJobs Estimate part, gives a general idea about salary to be expected.