If the alternative is to bin them and you don't have any other tomatoes for the baskets, I would try it.
I would try to force them into growing like a bush variety - stoping the main shoot after two trusses and letting the side shoots grow (1-2 trusses per side shoot) and cutting whatever growth you don't want. Could be fun
i reckon it could work but only 1 per hanging basket and even then it will require a lot of regular watering. You will want to encourage the plant to grow sideways and once the tomatoes start forming it will all trail and hang from the basket. Not sure if the weight would end up pulling the plant out of basket. One option for that I have seen dutch growers use is to attach a bar over the hanging basket, then use the bar to train the tomato around it so it grows up, around the bar, then hangs down for the remaining 4 feet.
There will not be enough compost in a basket to sustain a cordon tomato plant, they need a large pot, parallel, baskets taper. When you plant it out, or in a big pot, you drop them right down so a lot of the stem is buried, they then make roots all along the stem, thus making a strong stem support for the plant. You can do that in a basket unless you’ve got one about 15” deep.
Gardening on the wild, windy west side of Dartmoor.
Put them in small pots outside your gate and someone will have them. Some projects are doomed! I made the same mistake and I'm going to give away the spares.
Posts
When you plant it out, or in a big pot, you drop them right down so a lot of the stem is buried, they then make roots all along the stem, thus making a strong stem support for the plant. You can do that in a basket unless you’ve got one about 15” deep.