Thanks for all the suggestions. Hober appears to be the best, since you can choose both width and length. However, they are very expensive, especially since I would have to pay various taxes (they ship from Thailand and I'm in Europe).
I'm at a loss why everyone seems to make such long ties. It explains why everyone I know sports a huge Windsor knot. Even at 5'10", a four-in-hand knot would eave some excess fabric, unless you have very lowrise pants.
I have come across this website TieCreators - has anyone heard of them? They make a 'Youth' tie at 53" length and 3" width (https://www.tiecreators.com/tie-specification). Still not perfect; I would prefer a slightly slimmer tie - 2.7". This length tie specifically is 65 dollars, but if you make a large order, the price comes down drastically. 10 ties = 29 dollars (27 euro) each.