Does the exact form for a Covid test matter when entering Austria?

I am soon travelling from the UK to Austria (via Switzerland), and will self-test for Covid-19 beforehand. According to the website of the Austrian embassy in London, I must present a specific form signed by a doctor to say that my results are negative.

However, as a healthy person who isn't an essential worker, there are no options to get tested in the UK by a doctor at the moment: the only tests I can access are drive-through ones or self-test kits, and the results are sent by email. For various reasons, getting a doctor to sign this form after taking the test but before leaving the UK isn't realistic.

So (assuming the results are negative), if I simply present a print-out of the official results email at the border, is this likely to be accepted? My contact details are linked to the test, so if someone needed to, they could cross-check these details with my passport to confirm that the test is real. Since this seems to be the standard way the UK government/health system sends out test results, it seems possible that border control would be flexible about the exact paperwork required, though perhaps this is over-optimistic.

Ideally I want to avoid the 2-week quarantine period, but I have also heard that the travel restrictions to Austria are being tightened from today (23 Jul 2020) onwards, and so I am also concerned that having an invalid form could potentially lead to being refused entry at the border. Any information about what documentation is accepted would be helpful to know.