Is it not possible to select the paragraph and say "cache selection" or just say "cache document"? Afterwards, you should be able to specify single words for correction.
Alternatively, you could edit the text manually, and then say "cache selction"/"cache document" and proceed as normal.
The downside of this approach is that MSD will not improve by learning from your way of speaking and writing. So at least initially it may be a good idea to edit the text in the recognition window which will allow MSD to learn as much as possible. Later you can switch to whatever means is the fastest/most convenient.