The crack in the heel is a slightly tricky one - because it goes cross grain rather than with the grain.
My approach to it would be to firstly find a way to clamp it shut which is trickier than it might sound as you need a clamp that will push against the heel of the neck.
Maybe a G clamp that has the extra adjuster coming in from the side
Something like the one below

Once that is done I would chose to plug the existing hole with an oversize plug of hard maple .
I make hardwood plugs out of left over neck wood and use a Stanley (or similar brand) plug cutter like the one shown

I would chose one that is either 1/4" or 3/8" (they tend to be in inch measurements) and use it to cut a plug of maple with similar grain direction/tightness to the grain of the neck.
Now obviously you will need a drill bit of exactly the same size to drill the hole for the plug to go in.
Drill carefully going only as deep as the depth of the new maple plug (and no deeper than maybe 16-17mm - you don't want to go through the neck)and it doesn't need to be on centre with the screw-hole - as long as it completely covers the old hole.
Once drilled apply a little titebond to the plug and tap into place.
Once dried overnight you will need to level any dried glue and dowel/plug sticking out of the heel.
To refit the neck - - fit it back onto the body and push the old bolt into the back of the heel to leave a mark where to drill the pilot hole (v important to drill a pilot hole!). Take the neck off again and carefully drill a 3mm or 1/8" hole where the screw will go - drill it maybe 17-18mm.
Now you ready to refit the neck