Concept for using my 6mm Fire & Fury stands in Volley & Bayonet

I got the Volley and Bayonet rulebook a few months back as I'm looking for a grand tactical ruleset I could use to play entire ACW battles in reasonable space and time. The game uses three inch squares to represent brigades whereas my ACW is based for Fire & Fury with 1 inch * 3/4 inch stands.

Here's my quick and dirty sabot basing scheme:

I had some leftover MDF and I took some time with a table saw to make a hundred or so of these squares. Then I just sanded the edges, painted the base brown and glued on some terrain flock mix I used for my Normandy game. I then blu-tacked some  F&F stands on the base and there you go. The white slit is the space reserved for me to print out the unit data on. By placing down one stand per strength point I can give a visual difference between the small and the large brigades, which is an advantage over "static" 3" bases. The visuals suffer a bit but I think it'll work just fine. There's just one small problem:

The Blu-tack leaves an ugly mark once I remove the stand. If I don't use anything to make them stick, I think the units will be fiddly to move around. The small stands have a magnetic strip underneath so there is an obvious and attractive solution but metal bases cost a fortune, especially as I need a hundred of them to do a battle like Gettysburg.

Ideas? The solution should be cheap and quick to do.