seems like FME is a tad too agressive on the renaming, as "Unit #" is actually a valid field name in Access. Consider sending the case to Safe support if it's important to you.
On the other hand, I personally don't think it's a good idea to ever use spaces or special characters in field names. It has a tendency to always come back and bite you later, so I'd urge you to consider adopting something like "unit_no" instead.
Google "database field name conventions" for more ideas, there has been a lot written on the subject :-)
However, a field name containing some special characters is invalid in some softwares, not only FME. For example, a field name containing # cannot be defined in ESRI Geodatabase.
If the template could be modified through discussing with your client, I think changing the field name would be the best solution for the future.
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