AgraGlas Gel will stain pretty well with Laurel Mtn stock stains.
The AcraGlas gel mixes up into a cream colored stuff.
Best results staining I've had are letting the stuff set well of course. 3 days isn't out of the norm for me,,I want it to be cured somewhat though it'll be hard overnight. I use a incandesent light bulb to heat the area being glued and that speeds up the set time greatly.
File the repair down, sand it, ect. Don't get a slick smooth polished surface on any epoxy showing. Instead leave it a bit rough from the sanding. Sometimes I scrape the area very gently with a razor blade to just take a wisp of the surface down and leave it open.
Maple usually doesn't need much if any grain marks but walnut does and they can help break up the foreign look of a glue joint line through the wood.
The L/M stain will take to the AgraGlas Gel. But in different levels than the surrounding wood of course. So it's a tedious touching up and knocking back of the area involved using different colors very often. Also use colored toner in covering coats of finish to mask and break up those lines.
I've also darkened separated little batches of the acraglas once mixed with water based earth colors (raw umber, ect) for use in the gluing up process(doesn't seem to bother the stuff from setting up).
The small colored batches are used to swirl in streaks of color into the patch to help camo it. A toothpick with a dot of the colored epoxy does well drawn through the base epoxy. Then use the L/M stain over the top of that.
Takes some practice. Figuring ahead of time what the final color will be of the stained and finished surrounding wood so you can build the repair to match it is part of the technique.