The whole idea of this is politically-inspired b*ll*cks.
First, nothing that's subsidised ever works (too many examples to quantify.
Second, it's a waste of taxpayer's money. It's all too easy for the Welsh Assembly to spend money - it's not raised by them, so their pet schemes will end up costing the taxpayer in England, Scotland and Northern Ireland too.
Third, the whole idea's a non-starter. Those who live in South Wales look towards the English Westcountry or Midlands. Those who live in the north look towards the northwest conurbations of England. The only people who see the extemities of Wales as a unity are the politicos (Welsh Nationalists) and the bureaucrats. Everyone else has noticed the terrain in the centre.
If a service were ever run, my guess is that the subsidised seats would be taken by people working in the public sector, spending even more taxpayer's money.
Just remember - the public sector/government NEVER knows best how to spend your money.
Rant over. Normal service will be reumed shortly.