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Clamp a straight edge such as a long spirit level to the door with two clamps, at the required distance from your cut line to allow your circular saw to run along it nice and straight. And buy a decent, high tooth count, circular saw blade for nice smooth cuts.
No outlay on spenny new tools, upgrade of your existing circular saw, win win...?
But you miss out on the plunge capability, the strip on the track that prevents tear-out, and the ability to perfectly line your track to your cut-line without needing to clamp it.
I've owned a circular saw for 8 years and a track saw for 6. I have never used the circular saw since owning the track saw. It is that much better.
Clamp a straight edge such as a long spirit level to the door with two clamps, at the required distance from your cut line to allow your circular saw to run along it nice and straight. And buy a decent, high tooth count, circular saw blade for nice smooth cuts.
No outlay on spenny new tools, upgrade of your existing circular saw, win win...?