Not exactly the same, but we've had a Skype number for years and it works well. Ours is a UK number (but you can get an Irish one) and I've just renewed for GBP30 for a year.
You can call out on it using Skype credit (or a subscription) and the call recipient sees a UK landline ringing them. Forwarding incoming calls is possible (using credit), but unnecessary as incoming calls ring on any and all devices where Skype is active. If my PC, tablet and mobile are all on, Skype rings on all of them simultaneously until answered or until the answerphone feature kicks in. I frequently take calls to my Skype number on my mobile which costs me nothing on top of the 30 quid p.a. subscription. People ringing me (all from the UK) pay for a UK local call.
Paul