Chapter-head: number, title and subtitle

Chapter-head: number, title and subtitle

[Robert Blackstone]

Dear all, 

This is  the upper half of a post I submitted on jan 7 with two questions (which was rather foolish of me), of which the second has already been answered by Aditya Mahajan. 
The first, still open, question was: 

Presently I’m restyling a PhD-dissertation to make it conform to the requirements of an external publisher.
One of the items is the content and layout of the chapter-heads.
What would be needed as a chapter-head, of Chapter 1 for instance, is, on two or, occasionally three, lines:

- Chapter 1  (midaligned, boldface, smallish size (\tfa))
- some vertical space
- Chapter title (midaligned, SmallCaps, slanted, \tfc)
- some vertical space
- (for some chapters) Chapter subtitle, (midaligned, SmallCaps, slanted, \tfb or smaller)

Can ConTeXt be tweaked to yield such a chapter-head?

Thanks in advance for any advice. 
Best regards,

Robert Blackstone
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