The revaluation records show John Finlay renting plot 34 in Killymoon St in 1924. His landlord was Ellen Mullan. The property was a house, outbuildings, yard and small garden. His property was between that of Robert Mayne and Joseph Houston.
You could try the street directories for 1924 onwards to see if John is listed. That should give you his house number. I don’t know of any on-line for that time period but there are copies in paper format in PRONI in Belfast. And if you looked post 1931, you might get R. Finlay’s name, assuming she stayed there.
The revaluation records only go up to 1929 but there is a further set of records in PRONI that take the information forward to the 1960s. These are only in paper format and are in the reference series VAL 3. They may show R. Finlay’s full name, assuming she became the tenant in plot 34, Killymoon St, after 1931.
Can’t help with an obituary but it might be worth checking back copies of the papers in Belfast Central Library to see if you can find it there. Likewise for his burial place. There’s no requirement to record officially where someone is buried but the funeral arrangements are often mentioned in the papers. Tradition in Ireland is to bury the deceased 3 days after the date of death so check the papers for 14th & 15th November 1931. Try the Belfast Newsletter.