Another alterative would be to Expand your SGU file. I'd say make a copy of your current to experiment with so you keep your original.

Edit > Expand (duration of chords by 2)

It should set your tempo to twice what it currently is (do that manually if it does not)

You would then have
|C..............|G...............|Am.........Am/G.....|F................|
...
which would give more flexibility in placing the bass note where you want them. If you are exporting to a DAW for mixing, just use this for your bass part...

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