Good Stuff I carry, can't do a lot of digging, but for initial brush clearing:Fiskars Loppers (for big stuff) and Hand Trimmers (for small Stuff), a Sven Saw folding bow saw (from REI), and a hand chain saw, the kind with a blade on every link (from Amazon) which works well for larger logs.
The hand chain saw works really well with 2 people if you can get a buddy, a bit slower solo, but still very usable and it packs to nothing.
​
Remove the tree with a hand chainsaw. From your description, it sounds like these trees weren’t supposed to be there and are eating peoples’ chain rings and gears. You’d be doing everyone a mitzvah by clearing them from the trail.
And you can sing “IIIIIIIIIII’m a lumberjack and I’m okaaaay” while you do it.
Edit: Apparently this is both the right and wrong answer depending on whether the downed tree is a feature. From OP’s post it sounded to me like a recent accident, not a feature. Read the replies to this for good information.