Definitely a unique deck, looks like fun to play!
Like you suggested, corruption might cause you a little trouble, and since
Son of Hamfast isn't legal in Expanded, you can always reach for the next best thing:
Jarnsmid, Barding Emissary Since you aren't at nine companions yet, he would be a perfect addition. For 2 twilight he removes at least 2 burdens (if you have him just fight once) and is cannon in a skirmish (that's only 1 less than you usually get out of SoH for the same price). He also works with your
A Wizard is Never Late, if you pull one of them after already getting Gandalf out.
That being said, if you could make a swap for an event, I would definitely recommend adding another
AWINL, just to help guarantee that you get Gandalf out early. You have a lot of events that are centered around him, and you would have more of an advantage on your opponent if you can get him out by site 3.
Rohan possessions are generally strong, and with Merry you can always bring them back when any of those pesky Canteas discard them (or Corsairs for that matter). I love a situation in which you have that merry out and your opponent still has 2 vitality on some monstrous minion. As long as your Rohan dude is starting the skirmish with a
Rohirrim Helm, you can effectively use it twice
.
Sam, Needer of Vittles is a really cool choice considering that Pippin and Merry can be pulled back to hand every turn if needed. You won't be really flooding the pool to get rid of two burdens every turn...Corruption might struggle against this