Two hints that may be useful:
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Put everything you do with a SplineComponent into Functions that take a SplineComponent Object Reference as an input, that should help to reduce the copy and paste.
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The “Local” option of the Coordinate Space selection on the SplineComponent nodes relates to the Component Transform. So you either have to make sure that all your SplineComponents have the same Component Transform or use World Locations / Rotations instead.
One additional tip: I posted about an inconsistency in what spline InputKeys are in those nodes here Spline Component: InputKey inconsistency so just know about that…