I'd like to think a competition like this would enhance the chance of the winners of the All Britain Championship causing an upset further down the line.
From a Lancashire point of view it would probably mean the end of Pennine League but that would depend on how many clubs would enter the competition. Without sounding disrespectful to the other clubs there is probably 4 clubs in Lancs and 2 clubs in Yorks who are a standard above the rest. Like the Pennine league this could be played on a divisional basis.
Outside of London I think Warks has the most clubs and they appear to be the only County who play more games than the Lancashire clubs so I'd imagine it shouldn't be to much of a problem for the clubs in Scotland, Yorks, Herts & Gloucester. Others may tell me this is incorrect though?
Perhaps to get the competition you could have 4 groups of 3 teams. Every club plays one home and one away game. The winners of each group go into a semi final. Each team would play a minimum of 2 games and a maximum of 4. It wouldn't cause to much disruption to the season and it may provide the County players with adequate preparation for the All Britain.
Introducing the college's would be a good idea but given the time of year the College's might be to strong for the clubs who would only be beginning their seasons, you might provide a better insight into this UNI GAA.