You could use the Unicode character "combining long solidus overlay" (U+0338) ̸
However not all fonts display it correctly. You might have to embed a suitable font, e.g. Charis SIL, DejaVu Sans/Serif or FreeSans/FreeSerif/FreeMono.
For example d̸ear looks like this:
d̸ear (default font)
d̸ear(Lucida Sans Unicode)
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