Yes. I think this is the most reasonable option. I could also automatically export my agenda to a pdf, which I could read, but not modify, on the iPad, using D

Yes. I think this is the most reasonable option. I could also automatically export my agenda to a pdf, which I could read, but not modify, on the iPad, using Dropbox. Then, I should post-process everything to update my org-mode files. The other option would be to buy a Windows 8 tablet (like the ThinkPad Helix), which can run Emacs. But Windows ... that would be a sacrifice ;-)