What would really link Liverpool to North Wales would be a Dee barrage with both railway and dual carriageway running across it. It's been mooted many times, as have barrages across the Mersey, Severn and Morecambe Bay. However you run into severe opposition from Estuary Conservation Groups, whose opposition will only make us ever more reliant upon nice Mr Putin's gas supplies, or Chinese funded nuclear power stations, as N Sea gas runs out.
Liverpool is easily visible from the Flintshire A55 around Halkyn. Liverpool to Talacre is about 25 km = 16 miles as the crow flies. A Dee Barrage carrying direct transport links would certainly help the regeneration of Liverpool, which like Hull, finds itself rather out on a limb compared to Manchester. A barrage would probably generate a lot more electricity than all those hundreds of wind turbines standing out in Liverpool Bay, and more regularly.
Train times of 30 mins Liverpool to Rhyl. A hundred thousand Scousers more settling in Denbighshire and Flint? One can but dream, because we don't do big infrastructure programmes in the UK any more, do we (HS2 excepted)?