Bit concerned about the preoccupation with 5° bank ...
(a) around Vmca 5° is the way to go. Unless the POH/AFM says different, presume that book Vmca was determined with 5° bank. As speed increases, the bank can be relaxed.
(b) blue line will give you best climb at around 2-3°
(c) if you prefer 5° at higher speed, then consider that climb performance will be not all that much different to wings level .. so why bother with the effort to keep on a higher workload bank angle ?
I understand John the Wombat was a real handful
Had its moments ... Avalon for local with the usual howling westerly. Off to the south with full aileron into wind, fail #4 and if one were slow to reverse the aileron into the operating engines .. it all got very interesting ... very quickly.
But empty .. did she lift up her skirts and go ... MTOW a bit of a dog.