Jeff, l have installed a riser block, (the old style square riser block) with my WE130 and also with my Gen 3 Pro. Both set-ups use the lastest Gen 3 vises with the tension adjuster and split jaws.
The riser block does allow you to achieve lower angle settings. Maybe not as low as 12 dps. That depends on how tall the knives are. Also you can use the LAA after installing the riser block. Be aware that you will sacrifice the ability to get your very wide angle settings, that is greater than 20 dps or so.
You will need to purchase longer screws. They don’t have to be hex head cap screws. Flat head phillips fine thread machine screws work just as well. I think they’re 10-32 but I don’t remember off hand.