Hello Daniel, ref your post.
Have you checked www.rootsireland.ie which has Baptism/marriages for Cork North East which covers your parishes of interest. Parish records are due to come on line in July from The National Library of Ireland.
www.nationalarchives.ie has Census 1901/1911 also Tithe Applotment & Griffiths Valuation records. Several entries for a Christopher Upton on Griffiths.
Upton families still reside in the area.
The Gravestone Inscriptions of the Cathedral Cemetery of Cloyne has memorials for Upton including a Christopher (if you need details let me know.
www.historicgraves.ie (a work in progress) has 2 memorials for Upton references are CO-GKIN239 & CO-CBEG169