I used a roof:shape=dome for this church. I think successfully (F4map).
For common patterns of churches and castles it may be worth having a wiki page with some basic examples. For instance this is a very common style of medieval parish church in England. I’ve had rather less success with representing apses with a set of skillions (church in Zakopane), but if someone has evolved a successful approach then it’s likely that the approach can be copied.