Pulling a plastic streamer out of a small space may work, but it may get singed by sustainer jet.
Always go with lowest possible motor on SUSTAINER for first flight (consider adapter to go DOWN to an A8-5, low impulse, big nozzle, lights reliably.)
I assume you are using BP non-electric staging, so suspect you plan on using a D12-0 for booster. If you can get your total mass with the D12 down to 113 grams plus difference in mass between D12-0 and a C6-0 with adapter (not sure what adapter weighs, the difference in motor weights is about 18 grams) you can use a C on the booster, so it won’t stage very high. You can even go with a B, though when I have tried that, it staged on the rod. Felt pretty silly looking all over the place for the booster (we never saw it stage, and the sustainer deployed the chute, where the heck did the booster GO?!) and finding it the one place I didn’t expect, on the blast plate after sliding back down the rail!
Hope for a low wind day, and a flat field (mown grass if possible) with dedicate spotters for booster and sustainer (plan this ahead of time, I’ve had cases where all three of us were following one or other segment
)
Hope you get two straight trails and two short walks.