No, you'd have to buy all that furniture individually from the crown store - it may or may not add up to more than the original 1100 crowns. I'd say it probably will.
I don't think you can buy it furnished if you buy it unfurnished, though it's still a waste of gold and crowns if you could do both. You're better off decorating it your own way.
The Alinor Townhouse is the first house I have ever purchased furnished. I usually buy empty houses and slowly, very very slowly, decorate.
Needless to say ..... I have seen the light!!!
In this case, you get so much value for crowns. Definitely worth the investment, in my opinion.
I have not really done any cross-checking, but some furnishings are crown-store-only (such as books, and gaming dice). How many of those are used in the furnished houses?
Ive seen furniture bundles in the crown store before. So why cant you add that to your house? I dont eee why you couldnt add to house you bought with gold. It may not be the same furniture as the furnished house you buy with crowns.