True small caps for system fonts

My employer (a law firm) has adopted Century or Century Schoolbook for most documents I produce. (This is a result of a combination of style and very restrictive court rules.) I'd like to use a true small caps in those documents, but I can't find anywhere to buy a set with small caps in either font. Any tips? Thanks.

Century Schoolbook - What's What?

I'm considering using Century Schoolbook for a book project and looking into the Century type family has left me a bit confused..

Whilst going through samples of different 'Century Schoolbook's in use and what's available here at school, there seems to be stark differences between some of the different Century Schoolbooks I've found. I.e. Bitstrem Century Schoolbook compared to Monotype Century Schoolbook looks very different in continuous text.

Looking around at the Typowiki and Wikpiedia page on Century didn't help either. Any information on the different 'Century Schoolbook's would be appreciated. (i.e. What was actually improved on in New Century Schoolbook if that was the cause behind the design?)

(x) Headline from 1940s British Newspaper - ATF Century Bold {Mark S}

I’m designing a book (cover and inside) for a friend. It is WW2 shipwreck story, and the author really wants to emphasise authenticity. I thought using a font that was usual for newspapers in that era (at least for the cover, but maybe through the book as well) could be a way to convey this authenticity.

I have some scans of newspapers clippings which I put through WhatTheFont. (I’m a novice graphic designer, so my type history probably isn’t as good as it should be!). I don’t know how accurate WhatTheFont is, and maybe they don’t even exist in digital versions. Also, communication is the main goal here, so if I can find a good font that is close enough for the target audience to recognise it I would be happy with that as well.