Hi, a few thoughts came to mind to consider, although I have not tried it.
1, Gluing to the fingerboard could be messy.
2, If glued into a slot then the fret would be very low off the fingerboard
3, How do you stop the fret/string ends from ripping your fingers or hand, I can think of a way but it's very time intensive.
4. How do you stop the strings winding wrap from unwinding?
5, Flat wound strings would be better than round wound strings.
6, I would hate to have to level frets like that, Ha ha.
when i used split pins for my frets i just used super glue . i used a gel type. only 1 has fallen off but it was down the dusty end so i never bothred glueing it back on...
i dont think wound strings would make a good fret for the reasons Taffy said . If you tried to bend a note it would jump all over the place as it went up and down the windings.. step like its autotuned..lol
I have tried what you’re going to attempt, the outer wraps will unravel despite the epoxy? The ridges of the string wraps will give an awful buzz & they can’t be leveled without weakening the wraps? Toothpicks are super cheap & work well, but fretwire really is the best option? Stewmac #764 Narrow/Low or CBGitty Narrow/Low is the standard for ukes? Stewmac $5.89-2ft./ CBGitty $12.99-6ft.
FYI: I have used everything from wood, weed whacker line, cotter pins, copper/brass,steel,aluminum wire, glass, string, fishing line, Etc. Fret wire will outlast & outperform any alternative material every time?