I'll let you know if I ever see one. I watch ebay somewhat "religiously" for sewing machine attachments (Ok, so I've got an addiction".
It's easy enough to find zigzag (plain and fancy), blind hem, buttonholers, and hemstitchers with the top clamp. I even got a single thread embroidery attachment for a top clamp.
And if you find one, it might not fit the White - I was reading in my attachment book, and it said at one time there were 12 different configurations of clamp width and needle position.