I'm sure you'll get many different views on this, and there are those that have successfully managed to work and have a healthy, happy hav..and other's who have thrown their hands up in despair and put their babies up for adoption.
If you go the puppy route: They do not like to be alone, but many members here have gotten a 2nd hav to keep hav #1 company during the day..others who have a family member, friend, dog sitter/walker come for mid-day care/walk/visit, etc.
I would highly recommend working closely with a breeder who can identify a more independent personality type within their liter, its no guarantee that things will go smoothly, but its a step in the right direction,
I'm not familiar with the rules on fostering/adopting, but you can certainly look into it... A lot of times, the foster home works with the dog to help train them and break any old bad habits/ and fears before they re-home the dog and they are pretty experienced with putting a dog in a home that it will thrive in, and there are older dogs who do fine at home for a few hours and would be well suited for a working home, I know HRI is careful with placement, but I do not think they rule out working homes, you should put in an application and see where it leads..
and feel free to post or ask questions, we are all here to help and make new friends