In the WP article the description of this phenomenon is very brief, and refers only to Malcolm Petyt’s study and not to the Wells Accents of English (pp 366-7). It also cites as an example /æpsəluːtli/ for ‘absolutely’, which though certainly accurate doesn’t sound particularly Yorkshire to me.
Yesterday we went to see the disappointing film of Alan Bennett’s ‘The Lady in the Van’. The character of Bennett’s mother has a go at a West Yorkshire accent, but gets it wrong when she says ‘She smells like a bad dishcloth’ and pronounces ‘bad’ as /bæt/. This doesn’t fit the rule, of course. ‘Bad tea-towel’ would have been appropriate for pronouncing ‘bad’ as /bæt/.