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Reporting back on this.
Front brake we managed to successfully burb and squeeze out the air through the inverted method. Then add some more fluid in via this method.
For the rear I managed to get out the stripped bleedport on the shifter and do a standard bleed. Injecting oilat the caliper to promote the bubbles to migrate up.
@howard
"Bleed ports are buggered on shifters"
I thought by turning it upside down the trapped air would be forced (possibly slowly) towards the calipers allowing trapped air to be released there. However thinking about it I guess the valves on the calipers are designed to be bled the right way up.