Like the ab roller. or those big rubber bands that you lift with.
DO NOT install an aftermarket alarm. They will cause nothing but problems for you and your BMW. Trust me. BMW's like BMW products. On the average it will set you back about $700. That will include parts and labor. it sounds like you have like a 325 or a 330 or something like that. Right? more BMW from 98 and up were pre-wired for the alarms. they just need the brains in them now and the computer to learn there is a alarm in it. So please do not put an aftermarket alarm in your can unless you would like more electrical problem down the road.
I would say it depends on the type of dryer. I can remove my hose, and I just soak it in the laundry trough, (mine is very deep, but you may need to use the bath if there's not enough room). Then use a hose cleaner (like a huge bottle brush and swish it around inside. Then give it a hose out and all the loose stuff will just wash away. If its not removeable, then the other suggestions you have woud be more suitable for your dryer.
if it doesn't look /too/ urgent I might pull off my shirt. (i.e. a kid in a lifejacket is stuck in the deep end wants to get out) but if it is an actual emergency you should just focus on getting there as quickly as possible
