Romans 9 is a rebuke to jews who believe that just because of jews they will get to heaven. Has nothing to do about the 144000, who we are told ARE ISREAL
what paul is saying in romans 9:6 is that not necessary to be an israelite to be israel.
a gentile in christ is an israelite spiritually. (spiritual israelites.) so the 144000 are not necessary jews; can be gentiles also. the ones that follow the lamb where soever he goes.rev.14:4.
If they were ressurected and judged, then it is logical to believe all were ressurected and judged, they just got a front row seat because of who they were.