Sound change rules for erosion

Does anybody have a good set of sound change rules written up for
eroding a language with few phonemes and all open syllables (polynesian
feel) into one with shorter words, more phonemes, and complex Germanic-
sounding syllables?  I've never had the patience to play with sound
changes long enough to get a satisfying result.  It would be nice to
start with some naturalistic changes (running them through Mark
Rosenfelder's Sound Change program) and then tweak it.

Whenever I've tried to run sound changes, they've come out trivial and
lacking depth.

Thanks,
Amanda

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