I visited Benchoona on a route from Doughruagh and Garraun. The late Tony Whilde recommended ascending [Irish Walk Guides West] via a route above the place between Loughs Fee and Muck, though only if it wasn’t slippery. Whatever about up, I wouldn’t be a bit keen coming down that way. It is to the right of the ridge shown in the picture taken from the slopes of Garraun. Perhaps we can learn from HC Hart [Climbing in the British Isles: Ireland 1895] who seems to have a salutary experience on Benchoona: “The rock here is uncommonly dangerous to climb, being loosely constructed and apt to disintegrate in unexpectedly massive segments. On such an occasion, although against the dogma of climbing, a swift and sudden jump or spring is sometimes the only escape. The block – perhaps a ton or two in weight – which is quietly sliding, or more probably overturning, with its captive, yields momentum enough for a final kick to clear altogether to any preferable station.”
Carefully avoiding dogma or swift escapes, my tame suggestion for a descent is via the spur which goes directly East from Garraun. There’s some firmly attached but interesting conglomerate rock to look at on the way down. Linkback: https://mountainviews.ie/summit/310/comment/493/