OP, please don’t underestimate the power of a “cult” to ensnare your innocent children.
Many parents have lost children to various cults. They are so clever at attracting little ones and turning them against their parents. Don’t take a chance.
When my children were growing up, we did a lot of “field trips” to places to learn, but also to have some fun, perhaps with a picnic or a hike.
Perhaps you could take your children to the legitimate Latin Mass, and arrange for Father to meet with them and give them a tour of the church building and talk about the patron saints, and perhaps even give them a little “lesson” in Latin.
Perhaps the church has a graveyard, and unless you and your children are squeamish about it, you can walk through the stones and find the oldest grave, read the names of parishioners, read the verse on some of the graves, and of course, pray for the souls of those who have passed away.
And then go to a park and unpack a picnic and let them play, or perhaps visit
a fun place in the city (e.g., a Chuck E Cheese or a fun museum).
I can understand why you don’t want to drive for an hour or more just to attend the Latin Mass, but I hope you will consider my suggestion of making a whole day or at least a half day out of it and creating educational opportunities for your children.