When replacing my airbox, I always spray a liberal amount of wd40 on all parts that need to be joined together. That way everything just slips into place somewhat more easily, not that any of it is easy.

Patience and perseverance and maybe that screwdriver trick will help. Good luck.
Although I haven't had to do that for the air box, I have lubed other rubber parts to help them more easily slide into place. I would rather use silicone spray lube than WD40. It doesn't leave a film that attracts dust.