well, i'm going to be pretty hard core here to the op but bull to all of it. just because there is no spark is no reason to get divorced. look at how many good qualities you stated your marriage has versus the one bad, no spark. marriage isn't all spring time blooms and blossoms, sometimes its dropping leaves and cold winters. that's what marriage is, the willingness to accept all aspects and move through life together creating a future. the rest is a cop out. there are only very few good reasons to get divorced.
as far as your children go, being absent from their lives is something you will regret. you can do this but it will take effort and planning. i was on the road with visitation for my son and i was diligent about being home every other weekend for visitation and planned for all the other big moments. same as we do now for things even though the kids are full grown adults. you only get those opportunities once in life same as your children only have one father. i have step children i have been with since they were very small. they love me, call me dad, when they talk about us they refer to us as my parents, my son included, but even though they have always only seen their biological father a half dozen times a year they still love him. "by the way, he lives in the same town as the kids". that's just one of those things. don't be an absent father. i have seen how it affects the children. it is also !!!!!!!! " descriptive words of this nature are not allowed "
the whole thing sounds to me like you just want to bail instead of pushing through one of marriages tougher moments which all of them have. you should really step back and look at all you have and take inventory. you will probably see that you have some pretty irreplaceable items on your list. nobody said this was gonna be easy.
for information, my wife and i of course are both once divorced. we each have children from those previous marriages. she has two, twins, a boy and girl. i have one, a son. been divorced 22 years for me and 24 years for her and we have been married for seventeen years. raised our kids and they are all on their own. so, we do have some knowledge. just think long and hard.
