No offense but what's always with so much judo love on this forum? I'm not saying that throws/trips are bad, but I'd just much rather have a single.
TS check out how heavyweights wrestle, a lot of them try very hard not to be on their knees. It's all about the setups, once you can get a 2on1/headlock/underhook, you can work from there. What you choose to do, well if you can't go on your knees, just don't... ankle picks, snatch single, spinning behind from a front headlock, double/single/high crotch without going to the knee, duck under.