I love Glasgow's Riverside museum.
Lochgoin Covenanters Museum is good, not far from you Peter. Seems it's been improved since the last time I went.
There are some good Orange museums. The Museum of Orange is highly informative, Sloans House is where the first meeting took place and Dan Winters cottage is where the men decided to form the Orange Order, after the Battle of the Diamond.
I love Belfast. Hopefully get back soon and when I do will give these places you recommend a visit 👍🙂