I'm not sure that that will help you, but it is relatively easy for anyone
reasonably competent in Word to do this. I do it regularly, for single
pages, but it is more complex if the form has multiple pages.
What I do is place the scanned image (I usually take pages from PDFs, but
scanned images work in the same way) in the header - as a background - and
position it to fit the page. Then in the main body of the document add text
boxes (text boxes usually serve my purposes well, but are not the only way)
and move and position them over the spaces in the form. If there are many
boxes to fill in, the display can tend to jump about a little if all the
text boxes are anchored to a single paragraph. Depending on the complexity
of the form, you may be able to simply type in the document body, or perhaps
use a table, and space the text appropriately.
There is no magic bullet; Word cannot interpret the image, and each form is
a one-off, but it isn't particularly difficult once you know how.