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First place I'd start is a new starter relay. Jumping the relay tells us it's not the starter or electrical from the relay to the starter. Next, get two good 850 CCA or better batteries. good batteries can cover a multitude of sins.
While you're getting a new starter relay, you might as well get a glow plug relay as well. Both are cheap and you can do the work yourself. Where is the truck at and how cold is it when he lets it warm up for 10 minutes?
I don't know about the clutch. Your reasoning sounds plausible but I would imagine that they are hydraulic clutches and not adjustable like the old cable ones. When I wanted to start without the clutch (on other vehicles) I just removed the switch. As long as you don't have to double clutch and it's not leaking and does what it's supposed to do, I don't know if I would worry about the pedal sticking up higher.
Just my thoughts...
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