We routinely enter books in headline style, and journal articles in sentence style. We don’t do too many books so it isn’t too much of a problem. When books need to be headline, we set the style to Bibliography >Title Capitalization “don’t change” and when they need to be sentence style, change that setting to “sentence cap”.
Not neat, but it usually works.
But most of the publishers that have this kind of requirement have editors that are quite capable of sorting it out for you at the end. – focus on your prose, and get as close as you can in matching the host of variations that publishers come up with!