Chucks` little problem; Ans.1. remove fu..ed starter-assuming and being a professional bush pilot you will have tools...! Start good engine,and set low idle;remove starter from good engine,and fit to other engine; start other engine;recalculate wt.& c of g for starter removal,and complete all paperwork; the rope ?should have been tied to you and aircraft in case you fell in water !!
Ans 2; A la DC3,with variation,or a twist !; prime and set `bad` engine,run rope around spinner/hub in direction of rotation;run and secure other end under tension around good engine hub; leaving fuel/mags `off` on good engine,crank it over,so it may start `bad` engine. Repeat as necessary,until a) it starts b) you`re knackered c) the batteries are flat.
Ans3. You`ve just remembered the `hand-cranking` handle that you have /or,sod`s law, you`ve left behind !!
Ans 4.You could start the good engine,taxy out in the lake ,and attempt to go round in circles to get a windmill start !!