Fairly obvious but in case you haven't twigged:

For more dragoons, use the Italeri Prussian Cuirassiers:
http://www.plasticsoldierreview.com/Review.aspx?id=450

For more hussars, use the Revell SYW Prussian hussars:
http://www.plasticsoldierreview.com/Review.aspx?id=315

For more artillery (+ head swop)use Waterloo1815 Dutch artillery:
http://www.plasticsoldierreview.com/Review.aspx?id=326

Finally, I use a Strelets French marshal as Bernadotte, to lead the little force.

I really need to get another box of the HaT Swedish infantry though.....unless your plea to Strelets works!