I was thinking of Pelikano but I'm not sure if Pelikan still offers a B nib.
Lamy Joy or Safari you will get a very nice big B or BB, and replacement nibs are cheap and easy to buy.
Look out for B Parker 45s at sales or on ebay. They're indestructible though not that common. I passed up an opportunity to buy one with an IB nib for 10 euros once and I've been kicking myself ever since.
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