There isn’t really an inspired choice here, except for maybe Togwaggle's Scheme, which is just for pseudo infinite value on Tess Greymane. It’s probably even just better to replace it with Edwin VanCleef.
Given that you want to be using your new dagger a lot, Hench-Clan Thug would be a pretty reasonable inclusion, possibly over EVIL Cable Rat + Heistbaron Togwaggle if that extra late game isn’t necessary on top of Tess Greymane + Togwaggle's Scheme + Shadowstep.
Shadowstep might not be that good as you don’t have burn targets for it, but it’s good with EVIL Miscreant and helps with quest completion without having to do something like put Pilfer in your deck.