Name change clarification

Sorry, just a minor thing really.

I've not changed my name yet, but I have shifted to my more gender neutral middle name 'Alex' in most places (I've not changed it on most official things).

Would it be wrong to formally change my name to Abigail Alexandra and keep using Alex for a lot of public/work things?

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Is there an easy way to do a deed poll in this time of quarantine. A basic one needs two signatures but they can't be relations. I presume that will have to wait and I can't e-mail it on for someone to witness? If I wanted a registered one could I post it to someone to sign or do they really have to be there in person?

Just trying to puzzle things out, and being locked down at home is making me more anxious to move forwards for some reason.