Not sure if this will help, but our DD was a very strong sucker from birth, too, and refused a paci. She loved sucking an adult finger, though! (The little finger, offered with fingernail downwards was preferred!) Much easier than a paci as you can't lose it
So, we'd put her in her carry cot to fall asleep and if (OK - when!) she cried, give her a finger to suck and that helped her calm down so that she would fall asleep in the cot rather than nursing. But without the screaming.
Once she got to about 5 weeks she found her thumb and so has needed my finger less since then. She still has it when she's v. upset, or too tired and therefore flapping her arms about too much to find her thumb! Sucking my finger a but calms her enough to move to her thumb, and then I leave her to get to sleep on her own.
May not be the thing that works for your LO, but worth a try? In our case, she learnt to fall asleep in bed from about day 2, which I think is why she is now able to self-soothe and has been sleeping through the night since 6 weeks!
Also, I realised later on, she hates anything cold in her mouth (cold milk, calpol etc!) And the paci we offered her was straight out of the sterilizer so cool and wet. Which must have been a bit of a shock after warm, soft things like nipples and fingers. So, if I was trying to offer a paci again now, I'd be tempted to try and find a way to warm it up a bit first. Might interfere with it being sterile, but I don't suppose my finger was ever sterile either!
Hope you find something that works!
Cathy