I finally pulled my finger out and spliced it up this morning. Pretty straight forward. Bit of measuring, bit of trimming here and there..
Ended up pretty tidy in the end. I went for butt crimps + heat shrink on the joins. Used some plastic sleeving over the stator end and through the grommet, and then a nice big length of 10mm heat shrink up the other end which I slide back over the existing plastic tubing while joining, and when completed went back over the old to the new and fitting all the joins within. Pulled up beautifully and just needed a few wraps of tape at each end to ensure it's sealed up.
Haven't got around to kicking it in the guts or taking any measurements yet.. I probably should though!