I'm trying to think which ones you mean. Portugal? Supposed to be getting a transport-oriented LPD, but it's taking forever. Belgium? Had a similar project, but it was canned. Belgium seems intent on arming its forces only for a peacekeeping role (scrapping all their heavy armour, artillery, etc), while not providing any of the logistical backup peacekeepers need....And its not just Ireland. There are more European nations with the same inability, some much larger than Ireland. Frankly, I don't understand why they don't want a any sealift capability. Their soldiers deserve something better than a rust bucket.
Several countries contribute to the joint transport group, which has long-term leases on a few civilian ro-ros, notionally assigned to the Danish navy, IIRC. I think they're capable of carrying anything short of a Leopard 2 with no adaptations (they're designed for Euro standard 44 ton trucks, nose to tail), but Leo 2s may need some deck plating to distribute the weight. Denmark itself now has Absalon & Esbern Snare, but is still in the pool.
Interestingly, a spare UK Point-class ro-ro has been hired by a neighbour at least once. Seems their own ships were busy.
I think that a joint purchase of some more Point-class, to replace the leased ro-ro pool & add more capacity, would make a lot of sense. The for-hire UK Points could also be put in the pool.