What do you mean "bend"? As in, turning corners, in the PCB layout?
Use arc segments (trace length = mean arc length), 45 degree corners (close enough not to worry about), or 90 degree corners with a chamfer (trace length follows the inside path).
I doubt the quarter-wave lengths are very critical: your bandwidth is quite large (>50%). Can always design it for extra bandwidth (the result will be a couple extra steps), to get even looser tolerances.
Note that the trace edge-to-trace edge distance should be 2-3 trace widths minimum.
Tim