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But my jigsaw has a base plate. That would be up against the guide
ripper on the sawboard, so enabling a straight line cut. ?

In theory - but it doesn't really work like that. The blade will often
flex at the root, so you appear to be following the line until you get
to the end and find that the top may be a straight line but the bottom's
wandered all over the place.

If you ain't got a circular saw, just use an ordinary hand saw, it'll do
the job in less than a minute and be much much straighter and neater.

--
Skipweasel
Pay no attention to that man behind the curtain.