dude dont worry,
im making a bunch of soundpacks in time (i hope! - not a matter of can or cant do it - its a matter of time - i hold certs. in sound engineering) its just a matter of playing around with your sounds, grab cool edit pro or soundforge and tinker away. might take some time, but the quality loss shouldnt be too bad. HL seems to *muffle* the sounds slightly, so you can always lower the quality a tad, smooth them over just a tad, or even enhance the sound to be a tad more grainy cuz HL seems to muffle it a bit, smoothing it. - hope this helps in any way.