Well personally I would just land at landholm and give the tower a ring on the phone then when they say right go for it fly through and land and go to the hangar.
Forget pissing about with transponders etc apart from keep your mode C turned on incase someone is coming in for a cheeky visual from the south. Fly to landholm at 700-850ft agl and you will be sorted.
And as everyone knows all position reports in Orkney must be done relative to twatt.
And HD getting a landing clearance by phone is not unheard of up north. "When you turn finals I will ring twice and thats your landing clearance then taxi back to the hangar" all while you hear eastenders music in the background. Nearest known traffic in the air is on approach in ABZ 200 miles away.
And if "whats ya wx loon" "****e mate" "aye but is it do able" "I said ****e not minging, hurry up I want ma newspaper with ma breakfast" works I suspect piper's way of doing it will work as well.