Get the stock to final contour. Cut some maple so that you have several pieces that together will OVERFILL the hole some what they should be tapered. Glue hole with Titebond or similar. Glue the ends of the pieces.
Put in the first two-three then DRIVE in the rest or last one carefully with a 4 ounce hammer. Let the glue set and file back to contour. If this changes the outline of the hole so much the better, perfectly round may be harder to hide than something not so round.
The pieces, with a little luck will look like a wood flaw, unless perfectly round, once stained and finished if it does not look right then, before finishing perhaps, use a needle and some dark stain to tattoo something that makes it looks more like a flaw.
Dan