I really like that idea. It adds an interesting aspect to the army of Dol Guldur, and it explains how the army would cross the Anduin to attack in a place the elves would not expect. That fleshes out the last bullet on my list.
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but even though they are tough, one group of trolls alone won't make the difference
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Actually, the fact that a group of trolls
would make a difference would speed the scout troop on to try and reach Lorien ahead of the army.
Obviously, the scout troop would cease to follow the army after they learned their plans, and take a more straight route to Lorien. So, the envoy must be captured before the army starts making their way in a loop around.
I like the idea about the Woodmen. It is likely that Lorien understands that Mirkwood is in the same position as they are, if not worse. But, the fact that they are sending out an envoy: does that mean they know already that an army is marching from Dol Guldur? Or is this in response to a previous attack that did great damage?
I believe the latter is more convincing, but...it emphasizes the fact that Lorien is weak. And so it is going to take a lot of speed, skill, and luck for them to use the knowledge of the army's 'surprise attack' to their advantage'. But, I think that will add to the story, actually. The desperation of the elves of both Lorien and Mirkwood will be much more dramatically expressed. And I have always loved a story where good overcomes the odds!
If we wish to make it more 'realistic', and not allow the elves to just overcome all odds and defeat the orcs, we can have the destruction of the Ring drive the orcs away after the elves hold them for a time, perhaps drawing back closer and closer to the forest itself, since I expect the plan will be to meet the army at or as close to the Anduin as is possible.