I've only read articles and collected screen shots of Ring of Red (mostly in Japanese), so I don't know how many statistics there are or how complex they might be. From what I saw, it does bear some resemblance to the early Front Mission games, play-wise (but that's only from the screen shots). It also appears from the same screen shots and articles that you command about five walkers.
If you still want to go with the Silhouette system (which is the basis behind Gear Krieg), it has been streamlined for faster play with Heavy Gear Blitz. If you can find a copy of the original HG:B! (not Lock & Loaded* ), there's a page showing you how to convert vehicle stats from HG 2nd Ed. to Blitz. GK and HG 2nd Ed. are both Silhouette, so it's pretty much the same process. The other thing, apart from simple vehicle stats, are simpler infantry stats, where each unit is simply a combined unit with one hit per base.
*Lock & Loaded is an updated version of HG:B!, but forgoes the conversion page.
There are also the Gear Krieg supplements for World at War, but I haven't played the system, so I don't know how much faster it is.