It doesn't really matter how "clean" carbs are as long as the carbs are starch or dextrose with a little bit of fructose if you want. Well, maybe that is what "clean" means.
Count on being bloated, as this is what happens to most people. I don't think it's a bad sign --- it just may seem disheartening. Compare your weights week to week.
When I keto dieted, I became bloated after every carb-up, but I lost weight overall. Just remember to count your calories for the week and make sure there is the deficit you want.
I think it is possible to carb-up without bloating, but I think it means that the carb-up is not really complete (i.e. no supercompensation).