No.
I am about to get a dog after years of thinking about it. My children wanted one for years and years (they are all adults now) but our lifestyle just didn’t tally with it, both adults working full time (I was an HCP working shifts), regular weekends and evenings away, kids activities meaning we were out of the house a lot. Of course the kids promised they’d do all the dog related stuff but we’ve had cats all our lives and it’s always me who takes them to the vets, who does the worming/fleaing, does the litter trays, so I knew that it was nonsense. They’d do the playing with puppy (probably winding it up to the point of frenzy) and fair weather walks once the dog was fully trained and the weather was perfect and the time of day suited them. It’d be me out at 7am in the rain, wind, sleet and dark.
Our lifestyle has changed now, I’m at home, the kids are grown and we can plan our lives accordingly. It’s the right time to get a dog. I know you aren’t concerned about the time commitment but I would seriously think it through as the only adult in the household. No matter how well intentioned your children are, they cannot be relied on to do the lions share of puppy/dog care, especially as they grow up and want to spend more time outside of the house with their friends.
Financially, animals are expensive. My cat has comprehensive PetPlan insurance with £7k per year, per condition. He is only 2 and perfectly healthy with no long term conditions but his insurance is still around £30 a month. We had incredibly expensive and difficult decisions to make with previous pets and so we’ve gone with the best insurance we could find. We will do the same for the dog we are getting in a few months time. The insurance for him will be around £50pm for equivalent cover. Obviously then you have to add on food, treats, regular worming/de-fleaing (your vets might do a plan), things like crates, beds, bedding, toys, collars, ID tags (legal requirement), leads, harness. A never ending list of stuff of spend your hard earned £££ on.
That said, you point out that is if the kids didn’t want one, you wouldn’t have one. So, please don’t get one.
Suggestions re dog walking for charities or rescues. The rescues in my area won’t allow under 18’s to be volunteer dog walkers, so check it out before you make any promises to the kids.