back to earth? it's quite exciting on the Enterprise
For your Gb9 in fingered try GM7#5 as D#, F# G, B ?? any old dischord will do for hearing aids?
the punch in problem is just a question of punching in a measure earlier so the chord is recognised at the right point.
alternatively: easy to use note edit in the sequencer record & edit menu to enter the missing chord at the right place.
for a train whistle, you can use any of the whistles in the flute section, dirty up the sound with a suitable dsp or digital effect (personal choice), and the most important part is a good old whooo whooo on the pitchbend wheel. Record it into composer or pad when satisfied with the result.
"Transporter room... Energise!"