What you’ve outlined there Chris is the same as in the video I did for you earlier and Steve suggested initially. Well done for working it out.
The other methods suggested by Hudson555x and myself are alternatives that don’t require you to slice, copy & paste a track, but what matters is that you have found a method which works for you. Maybe you’ll prefer a different method further down the line. I’ve worked with vector GFX for years so I prefer to design my titles/GFX in 3rd party software and import a transparent PNG into Shotcut, but had I not had that previous experience I’d possibly have used Steve’s or Hudson’s method. Experiment with different ideas until you settle upon a workflow that feels comfortable and enables you to produce work you’re happy to put your name to 
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