Axes are of limited use when splitting - really they top out at small to medium trunks. Somewhere on here there is an illustrated article on how not to damage an axe helve when splitting that I wrote years ago. One of the main things is to have a proper chopping block at knee high or higher - not around your ankles. Your helve should be parallel to the ground at impact
Good angle by
British Red, on Flickr
If you are splitting a lot of large or difficult wood, maul, steel wedge and sledgehammer are the way to go
5) Hand tools by
British Red, on Flickr
With the right tools, metal pounding metal is the only way to go.
I'm with you Red, if you want to split wood, get wood splitting tools, rather than cutting tools.
I've been using a splitter since I worked casually for a purveyor of quality firewood as a lad. £30 for 5 tonnes split, you'd be there all day with an axe, with a splitter on the other hand (is that what your calling a maul ? on the right after the sledgehammer) a fit organised lad would have it done by lunchtime or shortly after.
Of course synthetic handles are the way to go as they simply don't break, even when misused, mine is 22 years old and although chipped here and there, it's still going strong.
Making ones own axe handle in the bush? Good luck
Changing handles, is easy enough to do, tools; a penknife to shape the neck a wooden mallet to tap the heal of the handle to bed the head and a hammer for the wedge (if the wedge is steel, if wood a wooden mallet will do if done with care). But wooden handles are too much hassle for regular use.
Difficult bits, shed pigs, take a bit of thought. I've never had a bit thats refused to split although sometimes thats meant leaving it in the shed for a few years with periodic test whacking, nothing better or more satisfying than a yielding knotted pig of several years vintage.