What am I risking by exporting 60i footage into 24p footage, and what can I do to overcome the consequences?
You risk very jerky playback or ugly, nasty frameblending simply because... well... you have 60 images per second and turn them into 24, which means 36 of them have to go somewhere.
And now for my usual rant:
24p Playback is another of those huge internet things that is utterly utterly misunderstood and completely useless.
Films in the cinema project at 24 frames per second, your TV doesn't, your DVD player doesn't...
Which means: Unless you plan to showcase your film in a cinema, blown up to 35mm film which plays at 24 frames a second, having a film in 24p will give you a film in a format that neither your TV nor your DVD player properly supports. Your computer monitor does, okay - but unless you directly film in 24p, whatever you'll do to your material in postproduction to turn it into 24p will only MAKE YOUR FOOTAGE LOOK WORSE
24 frames per second won't somehow miraculously make your audience go "Whoa! This looks like a theatrical film man!". Yes, I realize that the NTSC format with its 29,97291738 frames per second probably looks like video to you and different from film - that's because it IS video and not a film! That's not per se down to the framerate.
So take my advice: Unless you are really planning to blow up your movie to film and have it projected in a cinema, don't bother with trying to turn anything into 24p. It will not do anything but screw up your footage.