Is it possible to add in dejaVu these two characters ?
LATIN SMALL LETTER K WITH DIAGONAL STROKE, (U+A743)
LATIN CAPITAL LETTER K WITH DIAGONAL STROKE, (U+A742)
There is a description of those letters on this page [fr]:
U+A742 and U+A743 were added to DejaVu Sans a while ago. They still need to be added to DejaVu Sans Mono and DejaVu Serif.