I guess the only thing - I - can say, is the same way I would raise ANY child.
Between Lazarus and I, we have a combined total of 4 children. Two of them are going to be future ticklephiles, guaranteed. One is mine (daughter, age 8), and one is his (son, age 8). Our 7 year old is not afflicted with any interest in it at all, and our 3 year old...well, it's just too early to tell.
Of the two who obviously have inclinations toward tickling, we do not do anything differently with the two of them, than we do with the other two. We try to portray tickling as normal, healthy play between two or more participants. And because of that, our daughter never thinks anything of straight out stating that she wants to "play", and our son never wastes a single opportunity to "attack" my daughter or I. We have a lot of fun, and in our own parently way, we make sure it never gets out of hand (no means no, for instance, and stop means stop, and no pinning allowed).
Neither Lazzy nor I ever did anything with these two, from birth on, to 'nurture' their interest in tickling. It just happened, and it continues to grow for them as they grow older and become more acquainted with their bodies and their minds.
We also never did, nor would we ever, DISCOURAGE them from engaging in tickling play, unless of course it was inappropriate.
The only way we can see dealing with this as they grow older, is to make it clear to them that our door is always open, should they ever feel the need to discuss anything with us. And that includes budding emotions and interests in our own field of interest.
My parents were extremely open with me about all sexual issues. Everything from teenage sex to fetishes to sex with the same gender partner. And that carries on to this day. When my tickling fetish creeped it's way out of the closet, and became known to them, they were both very cool and open minded about it, and quite frankly stated that everyone has fetishes, even them, and that mine was completely normal and nothing to be embarrassed about.
I hope that our children feel that same open minded security from us when the time comes for them, and that they'll feel comfortable coming to us for advice, support, and mental comfort.
Mimi