From what I read some time ago, the american importer of BSA and other british marques, bought Indian..... only to use the network of dealership. In the late 40's, british sport bikes were the rage, and the buyer couldn't care less for the Indian, whose main attraction, the chief, remain unchanged for many years and only when DuPont was the owner offered something like 30 different colors for the same model.
You know who will succeed? The italian Benelli. Bought by a giant chinese bike manufacturer, Benelli bikes like the Tornado or the Cafe Racer are still build in Italy, but the plans are that they will be manufactured in China. Can you imagine buying a Benelli Cafe Racer for less than a Honda Fireblade or a Suzuki Gixxer?
Now that's a good selling policy. With a right price tag, you can sell anything. Nobody will pay more for a new Indian, built by people who are not bikers, and suspect of many early teething problems. And if you use an engine by another supplier, you can't claim the "heritage" factor, the only reason why somebody in the 21st century would buy a bike with an engine with pushrods.
I think the best idea would be to rebadge chinese bikes, but increasing the overall quality, and once the brand is stablished, start to spend the dollars on the development of a propietary engine -something that can take very much money-. Or reach an agreement with any of the four big japanese brands, to launch limited edition of rebadged japanese bikes. Anything with a "limited edition" and a serial number will sell like hotcakes.