This is precisely what I'm doing in my current playthrough. Every single lord in my kingdom is the type that likes you for having honor, so I never have to micro-manage them. Here's what I did:
Early game:
Long trading routes to build wealth. I made it a point to help any lord I saw imprisoned in a castle or town, building relations and honor. All heroes were immediately sent on support missions to build Right to Rule. I also set up enterprises in every city
Working for a faction:
Joined Vaegirs and helped them eliminate two factions, the Nords and Khergits. Nords so I can freely use Huscarls later on without worrying about fighting their mother faction. Khergits because I just hate fighting them on the map. I spent a long time afterwards just building up crazy amounts of troops. The game was going on really long by this point, and lords were starting to defect/exile frequently. The next time war started, I went on a conquering binge with my Huscarls until the king eventually denied my request to own the fief. A nice side effect of the constant exiling and defecting (and thus low king-vassal relations) is that all fiefs were going to either the king or myself, so I was able to take like a quarter of the map with me.
Starting my kingdom:
By this point, I had excellent relations with all of the upstanding lords. And since all of the lords were already jumping from kingdom to kingdom, I immediately had a handful of lords on my side. I could also immediately tell which ones are upstanding simply because of the relation level built up over time from honor. I didn't get much time to try out my vassals in combat since the Vaegirs already had multiple wars going and made peace with me very quickly. But at the moment I have 10 upstanding lords with 140ish soldiers each, and I'm just waiting for the next war to break out. I didn't have to persuade a single one of them to join my side.
If you're wondering about my character itself, he's int-based so a bunch of the party skills are at level 14.