I have the same issue, but the Preform solution would be inadequate as my parts need to contain pressure. My solution is to employ pins/small rods in the proper location and subtract them from the model. I then copy the pins and create copies at 90% and 95% and print them at the same time as my model. I can then epoxy the suitably sized pins in the model and trim them flush. I use the original non-vented version of the model to send to the injection molding companies for bids and the printed and patched version to send to the casting companies for bids. It serves as a good method of evaluating multiple production methods.
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