How about a mercury tilt switch ( like in http://www.technologystudent.com/elec1/switch4.htm ) or equivalent ?
You need to put things into perspective. If you reuse these switches and properly discard them at the end of their life there is nothing wrong with them.
The amount of Hg that humans have already spread in the environment and continue to spread is enormous. You contribute to that simply by being alive and using industrial products.