I think it's probably okay if you use it cautiously, for a limited part of the day or night, but I'd try to hold off awhile longer. I'm the biggest fan of pacis you'll ever meet, when they're used carefully, but I think a week and a half is still too young to introduce it without being very careful that baby is still spending a LOT of time on the breast. All that sucking is what establishes your milk supply, in the first six weeks to four months, and if baby is using a paci, your supply can be affected negatively.
I say try to hold off a few weeks if you can, but if you do decide to use it, use it cautiously, watch baby's output carefully, and baby's weight gain, to make sure baby is getting enough milk, and be ready to get rid of the paci if you see any sign of trouble-- taking a long time to latch, resisting latching, poor latch, reduced output, slow weight gain, etc.
The advantage of the finger is that you have to be physically present, and it's usually uncomfortable for you to keep doing it for any length of time, so that you're effectively limiting the amount of time baby spends sucking NOT on the breast.
Block nursing can do a lot to help with oversupply. Use just one breast for a block of time-- say three hours, or four. If baby wants to nurse again during that time, put baby back on that same breast. Then at the end of the block of time, start using the other breast. This is a supply-reducing technique, so you wouldn't want to use it if you had any doubts about baby getting enough milk. But if baby is being overwhelmed by too much milk it might be just the thing to try.