Hi Simon 
Re. option 1, you may find this workaround useful (however, as they correctly point there, it has its drawbacks). In fact, it seems that the shinyapps custom domain feature is just about that (embedding the app as an iframe)
Re. option 3, I see now that the hyperlinks were working some time ago, but not now. So, if this correlates with some unlikely change in the firewall settings for https://www.bto.org/, this would explain the issue.
Hope this helps 
Cheers!
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