What about one Squawk and one freq, and since it has Strathclyde Park near the middle.....
The Strathclyde Gap:
From Stirling to Strathaven to Klmarnock to Inverkip.
A Squawk to show you are in it below 3,000 feet and listening out on xxx.xxx with the benefit to pilots that they don't need to follow all the chatter from Glasgow Approach or swamp Scottish Info with transits. We could even tx blind to each other for awareness of other traffic in the gap, making it like a huge extension of the Cumbernauld ATZ.
Glasgow ATC would see the Squawk and know where to find us on vhf.
I can't see it happening as someone will need to pay for the frequency.