I have been involved with miniature wargaming for awhile, but my interest in Histwar is solely as a computer game, where it seems to shine as the ultimate solo wargame. Given the amount of data (OOB, Doctrine, capabilites, etc.) contained in Les Grogs, it appears that you could make good use of it in Solo Wargames but that would be dependent on two primary factors, IMHO: time/unit scales and data reporting formats.
Time as a factor, becomes a consideration since Histwar is mostly a real-time game and you have to decide how to break it up into segments that consistently meld well with your miniatures table top. Scale is a factor depending on how your miniatures are based, for what rules, and what size battle is proceeding on the table top. Are you trying to replicate an entire battle shown on the screen that goes down to regimental, or lower, level; doing only part of such a battle; or playing much higher level with fewer miniatures?
My only 'hands on' experience with Histwar is the current demo, so I don't know what reporting routines will be built into the final game. You would probably need to have some form of a mini-AAR, with numerical summaries, that could be produced based on what time segments you have selected (per the para above). Based on what I have seen so far, don't think that reporting capability exists yet, but you may be able to extract the information in some way with the full game. If you raise it as an item with JMM, he may include some such capability as a patch or update.
Ref Solo Wargaming, there is a book by Donald Featherstone called "Solo-Wargaming", that presents a lot of good information on physical and paper-based techniques for such games. It has some excellent information that could probably be adapted to computers fairly easily by someone familiar with Visual Basic or one of the other similar languages. My copy is an old version, published in 1973 by Kay & Ward (London) and Frederick Warne (New York). I saw a new updated version of it about four or five years ago at one of the miniature wargaming conventions.