I've done a little testing.
I have a sample book that someone here created a long time ago that has is intended to test the fonts. This has a lot of different characters to see if the font displays them. I added "rightwards double arrow" to this and tested it as both an epub and kepub.
For the epub, it wasn't displayed with any of the the supplied fonts other than the two added for Japanese support. These are "Kobo Tsukushi Mincho" and "Kobo UD Kakugo". Unfortunately, these don't show italics or bold when used with epubs. I did have a version of Bookerly on the device. This displayed the arrow.
For the kepub, the rightwards double arrow was displayed for all fonts in the kepub. For most, it was falling through to another for support. I assume this is one of the two fonts above.
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