I have used a shop vac several times. If you poison the hole but the nest is on the other side of the attic, no effect. I hate buying poison and hate my family being near it. Except for ants & termites I will buy poison and use sparingly. I don't like killing pollinators, but if they nest in the wrong place I will be the winner.
Here's a few things I learned being the family "shop-vac guy" for wasps.
1) Bugs can't fly in a hose - they just tumble at the speed of the flow, and the impact kills them. Like hitting a windshield at 100 mph. You don't need to kill them more.
2) Duct-tape a 10-foot stick of rigid 2" ABS or PVC pipe to the flex hose. It's much easier to place a rigid pipe near the hole, and you are back a ways from the action. The wasps focus attention on the end of the pipe near the hole, not interested in the person holding the pipe.
3) The worker bees are feeding the queen. When they don't arrive with food & water, eventually she will get hungry and fly out. Once you've got the queen, the hive is 'dead'. I'm not 100% certain of this.
4) I found that you can run it for an hour or so, then turn it on again later, and get some more, and after 2 or 3 cycles you've won.
I rigged this up so I could see if they were still coming. It's a glass bottle duct-taped to a drainpipe "Y". You will have no doubt they are killed on impact. You can see in the pic there are insect parts spinning around in the glass jar. You can open the shop vac right away there is some movement but no flying bees.