"Slash" in figured bass

[Lukas-Fabian Moser]

Folks (& especially: Dear Werner),

in his "Anleitung zum Generalbasse" (and the accompanying "Practische 
Beyspiele") from the early 1800s, E. A. Förster uses a "slash" symbol in 
figured bass to denote a chord that is being described relative not to 
the current but to the next bass note.

From Förster's book: 
https://www.digitale-sammlungen.de/view/bsb10527178?page=64 ex. 141
I also attach an example from his "Practische Beyspiele", in which a 
slightly different layout is being used in which the slash and the 
figure are put separately over their respective notes.

Of course it wouldn't be hard to cook up a solution (using \markup in 
figures) for both styles, but I'd like to do it "the right way": Do we 
already have a suitable slash symbol? If not, how should it be designed? 
Has anybody of you already used this symbol?

Lukas

PS. Let me take this opportunity to say huge thanks again to Werner for 
his massive recent improvements in figured bass: With the new proper 
glyphs for slashed and plussed figures LilyPond can finally be used for 
scientifically accurate figured bass engraving.

figured-bass-slash.png
Description: PNG image