The only other productive way I can think of (as someone else mentioned) is finding just the right (local) Sigmarite Priest to talk van Hal through it. Or finding someone to find the right priest.
We don't really know any priests though. Just Kasmir and the Ranaldites.
Hence a hands off approach, because Sigmarite(or Ulrican) priests generally speaking do not like:
-Wizards
-Spies
Also for those considering Morr, keep in mind that Morr is not a particularly active god. His only point of alignment with Van Hal is the hatred of undead.
Shallya is out for anyone wielding a Runefang.
So currently my entire plan on the religious matters is to do our job very effectively, and be a trusted friend, so we don't stress him further.
Money makes the world go round. If we have funds, all other option could possibly be reopened in the future, and it give flexibily on how we want to react to future mischief or if we need to redirect funds to other threats.
Keep in mind that where long term funds are concerned the best is really taking the documents to restart the route immediately(with taxes).
Asset seizure is less lucrative than it seems(though I dare say there's probably a couple years worth of budget in there), since these guys are merchants. Most of their wealth goes into getting more wealth, so you have non-liquidatable funds.
Their documents on the other hand should contain things like:
-Regional demand maps - Critical to any trade route, as this info is held closely in secret by most merchants.
-Regional contacts and routes - Consider the Haunted Hills. WHF is not a happy place to be a trader in, and where these point out are the safe and reliable routes. We want to know where the roads often wash out after seasonal storms, where theres relatively few gribblies, etc.
-Asset listings. Wagons, boats, stables, warehouses. These things exist and are hard to seize and replace, but are integral to functioning. *Channels RL job in logistics support* Wilhelmina would BADLY want these before they scuttle the records and get repossessed by whoever got away before we got them. Paper after all, burns.
Oh and a little bonus for
us. Their documents and ledgers would also show us where their wealth is flowing toward. Not as good as interrogations of key persons, but theres a pattern to nail the backer down in there.