While I quite enjoy IHMN, I agree it maybe more for a bit small band than you seek.
As Sundayhero is registered as being in France, postage from either the UK or USA may be a challenge, though I'll point out Bigger Battles is available as a PDF.
Truth be, there are a number of rulesets that could scratch the itch. G.A.S.L.I.G.H.T. is worth a mention, though my own group plays an almost unrecognizable version based on long usage and agreedto adjustments.
...
See the above VSF Child Board:
http://leadadventureforum.com/index.php?board=15.0
Absolutely! However, as some of the earlier mentions are out of print or, even more so, difficult to find, might be worthwhile starting at the end and working backwords.

Alas, I think V&S&F might work well...
Actually, as compelling as a hopeless defense of Fort Zinderneuf on the Red Sands would be, I don't recall any rules including the FFL. Going back to looking...
Doug