if the front hub is a High flange design, you may find that a 265 would have been too long anyway.
i typically build 26" RhynoLites with 263mm spokes, front and rear.. DS and NDS... the two i have in front of me show nearly perfect finished spoke lengths.
PS.. Hub flange height barely changes final build spoke lengths. Punch a few variants into the online calculator to see. DS/NDS also makes very little real world difference... and most online calculators error to the long choice.