Purchase 1 x UV security pen off ebay or similar, or even a shop lol..cost me £3.00 off ebay anyway.
Unscrew top and replace the UV with an equivalent IR emmiter (no wires to add or solder, just bend and snip to match)
Remove pen and chop off the pocket clip bit if you want a really small device (the end is solid, so no nasty hole).
Howzat.....? I know it isn't one of them pressure sensitive devices, but I'm sure with a bit of creative thinking it'll be easy enough.
Just thought I'd send this post as a thanks for all the info I managed to derive from the forums. Hopefully will save some people,some time, money, and effort. Of course, I fully appreciate there are those among us who just like playing and reinventing the wheel. I do it all the time....probably just have now lol