I’m a cub leader, and will be doing this with my 4 year old.
For parents struggling to find stuff for your kids to do check out and look at badges for Beavers 5-8 cubs 8-10 scouts 10-13. A lot of work can be done at home and is educational- a lot of badges have free downloadable pdfs for activities and work. Google searches give loads of stuff other leaders have done as well.
If your child is already a member of the scouting movement take photos and collect evidence and the leader would be able to award the badge once scouting starts up again.
A lot of the activities can be scaled up and down depending on age and ability I have had 15 year olds doing potato printing and biscuit decorating and they loved it.
members.scouts.org.uk/supportresources/search/?cat=11,18
Search scouting badge requirements uk