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Other space games?

Yeah, so I would have liked to post this in the Addons section because I'm looking for help from coders and/or math geeks, but since it isn't really KSP-related, I decided on this place. Mods, please do move the topic if you feel it would fit in a more specialized section. Anyway. Here goes: I'm making a little 2D arcade space game that basically puts "Lunar Lander"-like elements in a tiny solar system with orbiting planets and moons. Fuel efficiency is obviously going to be an important gameplay point, and so I want players to use gravity assists etc. For that, I need to be able to show predicted trajectories. And that's where it gets complicated. I'm using Game Maker, and the tutorials, discussions or even marketplace scripts that I found on the topic rely on Game Maker's built-in physics. And those don't help me because obviously I don't have a constant "down" direction for gravity to pull in. I've only got relatively basic skills in GML (and I know even less about other languages) and while I'm not exactly sh!t at maths, high school was a long time ago. So I'm looking for help creating (or finding somewhere in the GM marketplace) something that will allow me to graphically display a projected trajectory. Since I'm not using GM's built-in physics, so far it's all just simple vector addition (current veloctiy + sun gravity + current grav-well gravity). But I have no idea how to draw a prediction, since my gravity direction changes constantly, and I have multiple sources of gravity AND distance thresholds at which they become active, like SOI's in KSP. Somehow I think that a frame-by-frame prediction of next x and next y over thousands of frames would kill most computers running this game. So. Is there anyone out there who... a) can point me to someone who knows this kind of stuff (the person/people who made MechJeb maybe?) b) can help me find something on GM Marketplace that would do the trick c) can help me directly with coding this d) ...has done this before and could help me port it into GML? Thanks very much.