Applying a vaccum could be a good idea but bike chains are pretty loose assemblies so I don't think there would be any real benefit. They do not have bushings like heavier roller chains. Instead, the two inner side plates are formed with inward protruding lips around the pins to provide the function of bushings. These protrusions from each side plate meet under the roller. Liquid lube place so as to wick around and under the roller will also be able to wick through the gap where the protrusions meet and lubricate between them and the pins, which is the principal place where the lube is needed.

larger roller chains as used on motorcycles etc., have a bushing that pressed in between the two inner plates, so lube place on the rollers can't get to the space between the bushings and pins. The lube must be placed in the gap between the inner side plates and outer side plates with the hope it will wick down and along the pins. Most motorcycle chains now employ rubber seals (o-rings etc) between the side plates to retain the factory applied lube between the pins and bushings, so externally applied lube can't really get in there. These are basically lubed for life from the factory and lube applied during use only provides for rust prevention lubrication between the rollers and bushings.