Weedy block paving

My block paved drive is big enough for 4 cars, and is about 20 years old. However over the last 3 years a lot of weeds have grown in the cracks (building work disturbance). A friend asked if his son could clear the weeds to earn some holiday spending money, but his father insisted he scrape between all the pavers - which was exactly what I’d said I didn’t want, as it would simply leave even more gaps for weeds. Well this year it’s terrible! In fact it’s doubly terrible because so many of the weeds are hairy bittercress.
I know that the correct solution is scrape, weed, power spray & brush sand in. It’s too big a job for me & I don’t know who I could hire. So I’m wondering if you have any shortcuts you’ve successfully tried?