I've had two thoughts recently:
If the view page started using embed.aspx for the viewer and if the embed.aspx page contained the page handler code, then this would solve every page on the Photosynth site as well as every synth embedded around the web. Nice and clean. You would tap on the embedded synth in the same way that you click an MP4 and Quicktime launches. In our case, naturally, the viewer would launch as with your current iphotosynth.cloudapp.net links, thus allowing mobile users to use the rest of the site (read comments, etc) if they wish and view the pano at their leisure.
The other idea that I had which requires less work, conceivably, (but is also less universally effective) is to edit the explore.aspx, search.aspx, and userprofilepage.aspx pages on the site to all link to the page handler for all panos. This would allow iOS users to browse the site and view any pano. I'm not sure how to keep them from clicking through to synths, though.