Hi,
The last time I contacted The West Glamorgan Archives on this issue, I got this reply:
'Coroner’s reports between 1900 and the 1970s have not survived'.
And so your only option really is to see if the suicide you're interested in was reported in the Local Press at the time. (My Uncle's suicide was, also the result of the Coroner's Inquest was reported, in 'The South Wales Post'). I'm not local either, but I wrote to Swansea Public Library, and they looked it up for me. (Either them or Bevbee on here did anyway).
Good Luck!
Romilly.