Is your injection pump an in-line one or a rotary one?
Can you reach the pump (I'm small, so I could crawl inside the side flap behind the front mudgard).
Whereabouts is the bleed screw that you are talking about?
Can you reach the injector pipes?
Loosening some of them then cranking the engine should bleed the system.
Do not overtighten them afterwards - they are easy to crack.
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