While I'm waiting on a bit more information, trying to dig in the thread for clues on how many men the North would be able to muster to the Wall on its own, and thinking of ideas for the North and Aegon...might as well also make a point or two about bowing our head or kneeling.
[X] Kneel.
We took charge because we couldn't afford delays or disorder, but Shireen's claim is the rightful one.
You could argue Robb won the war and therefore deserves the crown. He certainly has the power to back it up with the support of the Valemen, Riverlanders, and North. But it sounds somewhat similar to Renly thinking he should be king because he had the most support. If he kneels that shows that duty and doing the right thing matter, especially since Robb would be doing this when he has the power and doesn't have to relinquish any of it.
It's not like Robb would be giving up all the power. Shireen is nine. She'll listen to her advisers, and she would certainly listen to her future husband, who is the leader that won the throne for her.
Back to troop assignment for a bit...
Still looking for numbers on how many the North and Watch would have (between the veterans going back North with Ned and levies that Robb didn't have time to muster when first going South), along with numbers for each Realm and major naval assets...
But I figure we can at least work on an outline.
Going off of what
@Charcolt said earlier, we have 80,000 troops. Though I'm not sure if that would change with completing the ceremony to Shireen. The Stormlanders would certainly be more loyal, at least.
The exact numbers available from each realm is unknown.
Northern relief effort:
Manderly fleet: sending supplies.
Troops: 10,000-30,000. Tarly in charge. Might as well have our best commander help crush the Wildlings.
Hunt for Aegon:
We don't know where he is at the moment. A part of this would be making sure the coasts aren't defenseless (which also helps in case the Iron Fleet starts raiding), but we can't just sit and wait, either.
We can encourage 'trade envoys' from the Free Cities to Qarth on behalf of the Seven Kingdoms, but they are also tasked with covertly seeking information on Aegon. I think Lord Velaryon could be put in charge of this?
If we do find him, then we should have a force ready to go after him if he happens to be in a place we can get to. Davos would be in charge of the naval part of things for any force sent after Aegon. I'm tempted to keep Tarly in reserve for leading things overall (instead of sending him North), but we might not even find Aegon. Anyone have any ideas for another competent commander.
Force held in reserve for killing Aegon: 40,000
That leaves 10,000 remaining (assuming the reserve force has already left) for anything else that might come up, like the Iron Fleet suddenly deciding to play. But that's if we send 30,000 North, and I'm unsure about sending that many. As I said, trying to find some numbers (how many the North would have between veterans and new levies) and waiting on others (how many from each realm).
There's also the naval assets to consider. If the Royal Fleet is held in reserve to deal with Aegon, and it is sent out, what else do we have in case the Iron Fleet arrives?
The Estermonts may have some assets, and the Westerlands will have them too. Not sure if we can really force the Westerlands naval forces to go where we want, though. That leaves the Redwyne fleet, if it's intact.