Before I retired, we grew rootstock plants at the Horticulture College I worked at. If you can get seed, then go for it, I don't remember the varieties now, but I do remember the plants we grew would often suffer badly from Odema as they got to some size (6ft). As you'd be grafting at a small size, this wouldn't become a problem.
These are usually a wild tomato that would form small fruit, but they are poisonous if eaten.
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