How about cementing 4x4 treated fencepost at your shootin spot. Nail a couple blocks on the side of it at the right height and with a pad on the blocks, have at it. Who would care? Hang some surveyors tape on the thing and everybody will think it belongs there.

I never carry an appendage like shooting sticks because, well, I would have to carry an appendage like shooting sticks. We do all our shooting {except for initial zeroing} from sitting, elbows-on-knees, for accuracy. Field positions do frequently result in different poi than bench shooting.