As per Peter1's comment and his uploaded track no 3472 (Many thanks Peter1) an approach from the NW from the end of a boreen at 'Blue Lodge' F866 072 B may be attempted.
June 1st 2019 millsd1 and myself crossed the Shannon and made our way fortified by bacon and sausage sandwiches in Castlebar and thence to the end of said boreen. Our general plan was to tackle a circuit which involved the two Corranbinnias and Glennamong with track 3472 as our guide but doing it CW rather than ACW as our quest for VL glory continues apace.
As of June 2019 however the footbridge across the brook opposite the said Blue Lodge (parking for 3 or 4 cars) had been destroyed in January 2019, according to a local fisherman we encountered This means that one has to go further South and take a wider circuit than Peter's track to circumvent the many streams that come down from the coums and hillsides and this makes doing the circuit ACW much more practical. Peter1's warning that the bog should be crossed with care is well warranted. While it is generally easy going there are many areas of 'floating bog' which need to be traversed with extreme care as the underlying depth to solid ground is unknown and likely to be capable of swallowing an adult human! So leave it for good weather with a period of good weather beforehand is my advice. Once bog is crossed and when one reaches the spur at F894 038 C it is a relatively easy climb to the top.
We then continued across the arrete (which interestingly is a propriety brand of stool thickener and perhaps required if you haven't a head for airy heights) on the Corranbinnia summit, thence to Glennamong and back down to the bog, at which point we could not directly return to car due to the bridge being out and had to do a large dog-leg west to cross a number of streams high enough up before they became unfordable and then turned North and continued across quaking bogs circumventing little ponds to return to car, All in all a 6.5 hour adventure. Linkback: https://mountainviews.ie/summit/134/comment/20541/