Stu,
Firstly the contingency plan - you need a fallback before employing some beef on the end of an extension bar.
I am not familiar with how your sump is constructed, but if its cast and aluminium, the thread may "pick up" and you need to think about about a repair option, ie a local engineering workshop and a new "Helicoil" thread, removing the sump and keeping things clean.
A second hand sump is a neat just in case option.
If the sump is steel the threaded portion could well be a fabricated insert, so welded seams may be a sensitivity here.
My plan of action would be first to "cover" the likely failure options in your minds eye and then tackle it. For safety, make sure you have the car on axle stands. Remember if the loads are large something else on the structure may fail. Would be interested in any feedback as to how you got on!
Regards,
Julian.
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Seized sump nut. 
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