To fill the cap between the heel and the body,
you can make a paste from fine saw dust(neckwood) and epoxy.
Some use 5 minute epoxy with good results,
I do not like and use slow setting Araldite.
Make the paste as thick as possible and scrape and sand it afterwards.
If the cap is not too big it will be invisible after the guitar is finished.
Spruce is more difficult. Using a paste here will be visible.
Here is a good thread by Michael. You will get an idea how to do it
even it is not about fixing the chips around the rosette.
Use headstock design you like most.
Making own design is very satisfactory, but can be time consuming.