I actually live in the Falkirk area.
So either way is not too far for me.
I am going to the cairngorms this Sunday.
I am quite in a similar "boat" as you.
Usually, do solo hikes, walks.
I would be looking for at least 6+ hours of walking, so at least its worth to drive
So, if you're up for it,
You can come here next weekend maybe Ochil hills to start with.
Or I can come to Lothians, I honestly don't mind.