On that one , if I couldn't open the cracks wide enough to get glue into them and be satisfied that if was sufficient to hold,,I'd cut out the individual cracks a bit to allow it.
I sometimes use a coping saw if the crack is in a position so the sawing does not cut into any other wood or cut into the edge of inletting.
Here I'd use Dental Burrs to route out the cracks with the use of a Dremel (!! Oh Dear!)
Simple straight shanked small dia burrs with some length to them are great for cutting along the crack.
They are aggressive, cut clean and leave a cut no wider than the burr itself , if that is what you want.
You can cut away wood in odd shapes if needed and around corners , do undercuts, ect.
Each of those cracks can be routed along the crack lines and even then a bit deeper at the end of the crack line by simply tipping the bit and digging deeper under the wood.
If you want to include small staple repairs at the head, those relief features needed for the staple in the wood are also quickly cut out
cleanly with the same burr while you're at it.
When ready, glue up the cracks with sufficient glue to fill the small voids & add the staple(s) and replace the metal while the glue cures.
Lightly clamp into position so the wood can be set in the proper position.
With the cracks routed out and the wood relieved, the wood can often be pushed and pulled out of shape somewhat. Sometimes that's an advantage to correct small issues. But you don't want to overdo it. Not having the metal back in place when regluing the cracks can often leave you with quite a different inlet when cured than what you may expect to see.
Here's some Burrs I'm refering too. Not necessarily the only type. Just representative of the type I use. They come in all sorts of cutting head styles. I find this style easy to use when routing out cracks from the side of a SxS stock such as this. Called a 'cylinder cutting head' style.
Lots of them available on Ebay and other places on the Web and much less expensive than these..!https://www.walmart.com/ip/Meisinge...tner=wlpa&selectedSellerId=101004420