Isn't the main reason for VON the House K favour? We all need that, so is there enough without VON?
Here are several ways to get to 150 house K favor.
We will probably always do haverdasher and the level 5-6 house K bar quests.
Favor:
Haverdasher: 6
The Lair of Summoning: 9
The Chamber of insanity: 9
Ruined Halls: 12
The Forgotten Caverns: 12
Total: 48
We probably always do Tear of Dhakaan for the xp: That is 21 more favor.
So we're up to 69 favor after having done level 7 or below house K quests.
There is an option for the level 7 Taming The Flames for 21 more favor, but I'm sure Corwin would be reluctant to that quest.
At level 8 we can do:
Stromvauld's Mine: 15
Caverns of Carromar: 15
That means we are up to 99 favor after finishing the level 8's.
At level 9 we could do the Red Fens quests:
The Last Stand: 12
Fathoms of the Depths: 15
The Claw of Vulkoor: 12
Into the Deep: 15
That is 54 more favor getting us to 150.
If we skip Red Fens we can do these instead.
Ataraxia at level 10:
Sykros' Jewel: 15
Reclamation: 15
At level 11:
Made to Order: 18
That is 48 + 99 = 147. 3 favor short. So it means running Taming the Flames or the super fast VON 3 pre quest for 9 favor. Or we can do the Last Stand in the Red Fens. Easy access and quite fast.
So we definitely have options getting our 150 house K favor without touching the VON's.
One reason for doing the VON's would be to introduce Alrik to the Vault of Night. Maybe he will get a Sword of Shadows. However, we could run these on epics instead since they are great xp, gives tokens and not too difficult on epic elite.
Personally I would prefer Ataraxia + Made to Order over Red Fens. I can't remember the last time we did Made to Order. There are also quite a few House Jorasco quests we rarely run like The Enemy Within, Dreams of Insanity, From Beyond the Grave, And The Dead Shall Rise. There are probably reasons for not running these, but I can't remember.