So you can always take all your troops to a new castle/town and declare war on Elintor, because your town will be empty they will see it as take able and take it with very few troops in it then all you have to do is win a almost impossible victory vs 5-6 Elintor riders with a scythe.. I did it once, idk how but it happened, they surround you too easily, if you outrun them it's possible but then you have the archers, seriously the worse faction to try to sneak into. Well I haven't tried sneaking into Macavian towns but I do know of the horrors of the prison breaks alone. (I suppose you could sneak in with a few troops, I guess I don't learn that taking 100 troops with you will get you spotted).
Perhaps you want Sidherton? (The other mission gives you 7000 denar.. is it worth pissing off a faction to -100 for 7000 denar?), his gives you Darkforest Bow + Fornirion + 50 Geldairn nobles. One test game I started with 2 Darkforest bows in Forniron, a start as the viking with the extra companion.... That was when I was seeing why my companions wouldn't follow me and had saved after cheating renown so that save was garbage, could never find another Darkforest bow in a merchant at the start. (Pbodless was the answer to why)