emergency jewish advice needed!

guys, this is the situation:
- J1 has put forward an offer
- J2 still has a few interviews left but looking positive. may be a better offer than J1
- J1 wants to hear back before J2 can offer

is it ok if i do the following:
- accept J1
- finish interviews in J2
- to J2, i pretend like I'm still "choosing" between J1 and J2
- if J2 offer is better, i straight up dump J1 a week after joining and go with J2

can i jew the employers like this? will they invoke talmudic magick to curse me down the line?