Halfling Martial builds with support

I'm likely joining a campaign soon once they finish Sunless Citadel, and then continue on to either Tyrrany of Dragons or Out of the Abyss. I'd like to bounce some ideas I have and consider any suggestions people might have. The party currently consists of a Human Stars Druid, Firbolg Celestial Warlock, Leonin War Cleric, and a Lizardfolk Monk.

I think I want to play a halfling and take bountiful luck as soon as possible

There are three main classes I've been considering so far and why I'm interested.

1. Wolf Totem Barbarian. I haven't played a barb outside one-shots before and I like the idea of giving my party members consistent advantage. Would likely be sword and/board or TWF due to disadvantage with heavy weapons, likely prioritizing dex over str, but using reckless attack to compensate. I suppose I would consider a heavy weapon and str since I could cancel the disadvantage. Figure party could use a little tanking.

2. Armorer Artificer. Idea here would be using infusions to support the party. I could fill tanking roles and stealth depending on how I set my armor. The intelligence based class wouldn't hurt either.

3. Rogue. Fill that role in the party. Not sure about subclass, but I like the idea of bonus action hide behind a party member.

I'm also considering Taking either that artificer build or barb build to at least 5 before then going rogue from there. (I think either Mastermind on Artificer or Scout on Barb would would have some nice flavor and mechanics). I figure with either starting class I'd likely be using a weapon that would be eligible for sneak attack much of the time anyway.

I'd consider going Ancestral Barb or another subclass if it makes a particular build work better.

Any suggestions for builds here or aspects I might not have consideres? Open to suggestions based on what I've stated I'm considering as well as on the Party's comp. Note that while I like optimizing to a degree, I want others to shine with this build as much as I do.