I don't have a solution to offer, but I wanted to let you know that we are going through exactly the same thing and you are not alone.
I have a 10 week old ds who has also fought his sleep from day one. He prefers being awake and while he sleeps in his Moses basket overnight (though still wakes an average four times a night), he wakes up the minute you go near it in the day, even if he's in the deepest of sleep. I've also tried the pram, car seat, bouncer to no avail, so all of his naps are currently on me or my DH. I love the cuddles with him but, like you, I'm now at the point where I really need to get things done, so really need to find a solution.
He does sleep in his pram when we go out and if he's due a nap, and he also sleeps in a sling if he's walked for a little while first. The minute you stop walking he'll wake! I'd definitely persevere with the sling so that you can get things done when you need - our lo used to scream and cry when you first put him in it, but that's got less and less, and always stops once you start walking.
I've also started putting him down awake at a 7pm bedtime, with a nice bedtime routine beforehand. He does still need to be rocked until he's really drowsy, but he goes into his basket awake and gets himself off now, so this gives me a tiny bit of an evening to spend with my DH before I too go to bed in anticipation of another sleepless night.
The only other thing I'm doing is trying to keep his naps at consistent times, so he's at least building up a routine in terms of time, just not place. Like you, I also tried the PUPD method but stopped after two hours the first time and 90 minutes the second, as I just couldn't take any more of his crying. I'm not sure what to do next to try and get him to sleep anywhere else but on me, but I'd love to hear if you have any successes!