I am not the first to think of this, but...
Traveller setting, but Burning Wheel rules?
I mean, you've got lifepaths right there.
Aramis' suggestion of the 3 modes of play, BW would be perfect for either Agents of Nobles and the associated intrigue or Space Truckers and the associated under-resourced-leads-to-shenanigans (not so sure about Mercenaries).
I have never read Burning Empires, but I just read the wikipedia page on it (so I now a expert yo).
Anyway, am I way off base, or mis-jumping here?
For BW fans, it would work.
BE Tech Burner would work just fine, but the rules of BE are so focused upon Valen Invasion that you'd need some form of replacement for the
Infection subsystem (which is a Hub sybsystem in BE). Ironically, Mercs are the easiest of the three modes to do in BE, as it's got
Firefight as the primary non-social conflict system (and it's large scale combat, not personal combat).
BE's setting shows a lot of Traveller influences, and Chris Moeller has noted it's grounding in his Traveller fandom, but it's as far removed as Diaspora by VSCA/Brad Murray is from its Traveller roots.
BE doesn't scratch the Traveller itch for me. It does rock when run RAW... Chris Moeller noted my AP reports were spot on in the feel of the Iron Empires setting... and 90% of that was just following the rules in the BE rulebook.
Just to explain a bit: Each "logical session" is comprised of about 10 scenes, and comprises one turn in the "Invasion" minigame. The minigame drives play, and players vested interests tend to support their choice of actions and hence scenes for the session. And no, that's not an error...
Start of session, the two sides determine their side action for the invasion minigame. This results in (usually) players framing their builder scenes or color scenes to support their chosen action (getting those extra dice matters!), and once all the budgeted scenes are done, the infection turn is resolved. When the Infection Conflict is won, the invasion phase is resolved... and a major shift in the story takes place. My BE game, due to intensity, only lasted one phase, but it was the PCs rebuffing the invasion and pushing back REALLY hard - story wise, they had no real threat left from the Vaylen.