Supporting documents to convince "can not submit original invitation/accommodation"

I am an Indian citizen applying for UK standard visitor visa.
In supporting documents guide for visitor visa, it is mentioned that, All documents must be originals and not photocopies (I am attaching the screenshot).
I am going for a conference in UK, I have got invitation letter and accommodation letter in email as a scanned copy. It will take at least 10 days to get original shipped from UK to my place, assuming the organisers are kind enough to send original immediately.
What supporting documents should I attach to convince the Visa officer to say that I can not submit originals for invitation letter and accommodation?
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Invitation letters for the USA visiting visas and supporting documents
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