Go for it. None of that stuff gets translated to Scouts, BSA, or further than Cub Scouts.
If you need filler after they complete their appropriate year rank badge, put in whatever you like, as long as it is in line with the Guide to Safe Scouting.
Make sure to recognize their achievements publicly.
If you can find and buy old bling to give them, even better.
Just know that you may not be able to record these in Scoutbook... no biggie