According to Ph.Eur. direct inoculation technique may also be performed by adding your (in this case diluted) product directly to a volume of concentrated medium.
Example: Ph.Eur. prescribes a minimum of 200 mg of solid sample, the batch size implies a number of 10 containers. 200 mg/container x 10 containers = 2000 mg of sample.
This is aseptically weighed and diluted using for instance 300 mL of sterile diluent. In duplicate of course, since you need two different media.
When using 4x concentrated TSB, aseptically add 100 mL of said medium directly to one of the bottles containing 2000mg sample per 300mL diluted sample. Repeat for 4x concentrated FTM. Add 0.2 um vent filters to allow aeration. Incubate and process the bottles as usual.
You end up with 2 bottles containing 400 mL of sample/medium combination, but the media will be of the composition prescribed in the pharmacopeia, since you diluted it 4 times.