Yair . . .
SMLWinds. I really believe you are over thinking this.
It appears you are in the fortunate position of being able to purchase an excavator and a dozer . . . these are two common useful machines capable of a multitude of jobs.
In my opinion purchasing a forestry mulcher for one small clearing job seems a bit extreme.
I have cleared hundreds of thousands of acres from large tracts of farming country to the selective clearing of house blocks. If I were in your position I would handle it like this . . . .
Buy a 150--200 hp dozer with a conventional manual angle blade with a tree pusher a tilt ram. three tyne rippers and a walk in stick rake.
Alone this machine will do most of what you need to on the clearing side as well as building roads, ponds and other earthworks . . . it would struggle with very large stumps and for these you could buy say a twenty ton excavator.
I would start on the lighter stuff walking it down with rake and stacking at ninety degrees to the walk down direction. We haven't seen any pictures of your vegetation but there most likely not be too many trees you can't tip out after a rip around with the dozer . . . drop the centre tyne for clearing and ripping around trees.
Don't even mess with big stumps they are left for the excavator . . . oh to be in your position. (Big Grin)
I don't know about the "burnability" of your species but a ploy that works well over here on very large stumps is, rather than dig them out and having to wrestle with a five ton root ball I have just had the excavator dig around them, washed the dirt off with a firefighter (I use a thousand litre pod on the pickup) stack timber around them and burn them all in place.
Finally I should mention on the dozer you should spend some money on a proper protection canopy and screens . . . not so important on the excavator as hopefully it will be mostly digging stumps.
This is a decently fitted out farm machine . . . .
Cheers