Your question can be summed up with the metaphor: how long is a piece of string? Even with the parameters you specified within the question, there are still a gazillion answers.
More specifically, there is no one answer, there are many that are equally correct, and unfortunately the SE way of asking/answering is diametrically opposed to that.
Personally, rather than a bunch of parameters I would have preferred to see a bunch of reasons why you want to avoid the grapple. Is it a weak area? Do you have a bit of fear of it? Your art doesn't do grappling at all? You are sparring people who favour grappling and you're sick of it? If any of those reasons apply then it is easier to give you strategies to avoid grappling. As it stands though, a lot of techniques within the various arts can be applied in grappling situations, so much so that the answer I was going to give to your question was:
Don't avoid the grapple, learn how your techniques apply to the grapple.
To outright avoid grappling you might as well just concentrate on a sport oriented martial art that specifically precludes it.