Airshark says:
... Would it be possible to start our own rebellion ...
Sure. Most things are possible to try.
Airshark says:
... let the men convince their friends of our good intentions ...
That might be a valid firebrand, but, as things stand, they don't yet trust your 'good intentions'. So the best you could hope for would be for them to slowly help defuse the direct accusations and hostilities. They don't know you didn't do it, they just aren't convince you did anymore.
Airshark says:
... and march on the baron? ...
To what end? Anyway, that could come later, but that is a big step. If you want it, we can work towards it.
Airshark says:
... If they are farmers, they probably don't like the baron anyway ...
Hmm... yeah, sure, but many people don't like their 'bosses', moving from that to outright rebellion is not a thing most people do.
Everyone is struggling a bit, but the barons are not putting huge demands on the farmers to produce, so the neglect in the fields is not directly the barons' fault. If anything, the barons should really be more harsh for the good of the valley. Until things get really bad the farmers might still like these absentee barons?
Airshark says:
... might root for the enemy they don't know instead of the one they do know ...
Might do. What would that actually achieve in the world? You want these people to put the other baron in charge instead? You think he is any better? If your characters believe that, you can make moves to do that.
Airshark says:
... Talking didn't do any good, right? ...
In what way? Talking is seldom the
quickest 'solution'.