Think tank/ devil's advocate, mite not use as final plan in whole or part; but would look at from both angles:
Drop wires, unload weight from 1st/smaller tree top, strip rest of lower 'feathers' leaving spar and stub that is pointing right in initial pic and maybe a foot of spar above.
Extruding helpful boom(in chess game never use saw to throw away a helpful card/key position, ballast nor shielding etc.) for 2nd tree.
>>1st tree is already proven to hold more than has now, even thru storms(after cuts).
>>then fortify 1st tree in opposing direction than 2nd tree.
Use same rigging line or brace line to dispense with initial tree; when done with boom usage.
>>can use boom alone or as solo rig, shared support(dual lines) or just to take some rigging load off 2nd tree(single line).
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Would walk firmly, perhaps probe on ground opposing lean on 2nd tree, feeling for any sponginess.
>>possible bracing concern, bracing would be tightened up a bit as unloaded lean
>>once a bit of weight off is more sturdy, but potentially 'sloppy' too, if try to play off of it, would tighten brace to avoid impacting if rigging from,
that is quite a leveraged angle lean, thumbrule: 45degrees would be 70.7% of leverage of full potential of totally leaned over horizontal, parallel with ground.
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To me, nickeling and diming out is for when cornered;
try to play to art, and expansion of art of surgical large in high focus, trying to make that even the safer option of less renditions.
In the end is also a business of efficiency too, and possible hybrid of plans combined; but all different ways should be thought out i think.
Like chess game.