I went back through my photos of material from St. Bride, looking for anything usable as source material for Christoffel. There were several samples of the complete font, but all my photos are either too small, unfocused or at an odd angle to the page, giving a perspective distortion. Lens distortion is also an issue with some. To wit:
I have a few books with incomplete character sets, plus some running text in Van Dijck, but nothing comprehensive enough for my needs. Frustrating!