I proposed this yesterday morning half joking, but this is the rough idea anyway. I was do this trip myself earlier in year but cancelled due to weather (snow!)
Book the big dorm room here:
https://www.ballyhourahostel.ie/room/14-bed-dorm-room
^ I've stayed here before with a MTB group so can vouch for how good it is, basically 4* hotel in a hostel layout. CCTV, parking,secure,drying room, kitchen,awesome shower rooms, big dog, fluffy cat etc
Good Centra shop and a traditional pub or 3 within a few mins walk..
https://ridewithgps.com/routes/29344333 - Ring of Kerry + Molls Gap
https://ridewithgps.com/routes/29344533 - Dingle Peninsula + Conor Pass
https://ridewithgps.com/routes/29350624 - Molls Gap + Healy Pass
Avoiding motorways, Limerick is around 130mi from Dublin port and 115mi or so from Rosslare port.