Step kids staying with us over due date- long and complicated

Ok ladies. Looking for some opinions.

My husband has 2 children from a previous relationship (9 and 11 years old). They live VERY far away but we Skype 2 to 3 times a week and hubby travels to visit them every 2 months for 2 weeks. It’s a complicated situation but just trying to give general details. My husband wants to arrange to have them visit for 2 weeks over my due date. My due date would probably be towards the end of their visit. They have never been here and would have to be brought by their aunt (husband’s sister). I get along very well with my SIL and would love her here during that time. I am just REALLY nervous about having the kids during that time. I want them to be involved and to be here when baby is born would be really special. However, there is so many unknowns and I’m a first time mom. On some levels I also don’t think it’s “fair” to either myself or the kids to arrange it at that time as I think during my first (and most likely only) child birth I should have my husband’s 100% attention. At the same time, when the kids visit us I think *they* should have my husbands (and myself) 100% attention. It’s not feasible for that both to happen at the same time. The biggest issue is that if we don’t have them come at that time, my husband will have to go many months without seeing his kids in person and it will KILL him. In an ideal situation they would come and then I would give birth at the end of their visit but we all know that’s not something that can be arranged, haha. Also while here, they would end up staying (kids and aunt) with my parents after the baby is born- whenever (if) that occurs.

I know it’s long winded, just wondering thoughts and initial impressions.

Edit- my SIL knows my parents pretty well and the kids are familiar with my parents so that part wouldn’t be too awkward. And my SIL may bring her son who my step kids LOVE so he would be a good distraction for the kids (they don’t get to see him much)