The best replacement for splice is crowbar.

The best alternatives to splice are rated as following:
★★★★★  crowbar
★★★★  imovie
★★★  airbrake
★★  fused sentence
★★  slice
★★  knot
★★  run on sentence
★★  sendfile
★★  reeldirector
★  mechanical splice
★  run on
★  canopy
  unshift
  bow line
  bowline
  splice
  joinkeys
  elevate
  comma fault
  run-on sentence

Your alternative for splice is not listed? Suggest!
Speaking about splice, one probably shouldn't forget about icetool.

Other search terms related to splice and their ratings are:
★★★★★ icetool
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splice
crowbar
imovie