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How does one change their name to a squiggle, like Prince did? 

I changed mine to William Hill - it was a change for the better.I'm going to change my name TO Deed PollThat's Mr Deed Poll to you.
https://www.gov.uk/change-name-deed-poll
Here you go, from the new named directgov website this time.
Simple declaration forms you can download & it nudges you towards agencies, solicitors or the courts if you need to change existing accounts/records etc which I suspect you would as I'm guessing this is the next step from letter to your dad and isn't as frivolous as people may think. Maybe it'd be best to have a word with Citizens Advice Bureau or if you are in a union etc which offers a free legal advice service, have a word with a solicitor for how best to close that door and how deeply into your existing affairs you are able to effect the change.
*edit* if you're still executing your mums estate, the lawyers may chat over a cup of tea*
So Gromit - any thoughts on your new name?