> specific wavelength of the IR emitter, to match the receiver (eg:
> 850-950nm)

Have a look at this. It's small enough to perhaps fit where that tact
switch was

http://www.jaycar.co.nz/products_uploaded/ZD-1952.pdf

You'll notice that the peak is fairly well defined, centred on 950nm.
Other devices, like the IS1U60, are similar

http://jdlope.tripod.com/is1u60.pdf

Vishay, for example, make the TSOP17xx range, which have the
carrier centre frequency of xx kHz

http://www.voti.nl/shop/catalog.html?IR-TSOP-36

Wouter, your and Googled Vishay pdf link doesn't work, this does

http://docs-asia.electrocomponents.com/webdocs/00aa/0900766b800aa551.pdf

The devices above are self-contained and include lens, filter, amps
and logic output, which is much simpler than rolling your own from
discretes

There are more transmitters (ie LEDs) than receivers, so you might
find the receiver first, then look for the matching transmitter

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