5 speed changer

[Paulus]

I need a new 5 speed Sturmey Archer trigger Lever for my M5, and as yet cannot find a original flat changer. Would a thumb operated lever like this work?

 

[Bromptonaut]

What about this?
http://www.simpsoncycles.co.uk/product.php/1812/brompton-gear-trigger-sturmey-made-5-speed

 

[Paulus]

Thanks very much for the info.