Are you doing this as a business or as a favor to friends? I ask because if doing it as a business and you ever have to go to Microsoft for any support, the first thing they are going to say is it's an unsupported config and you have to change it to a supported config before they will support it. If that is not the case, try a fresh install of windows 11 (Not an upgrade). If it has important data, back that up and save it. The best you can do is try it. If you told them years ago it needed replaced and they ignored you, try installing it, if it works great. If it doesn't work tell them so and that the hardware isn't compatible and they need to replace it. I retired from IT work in 2023 and there is only so much you can do for a customer. When someone wants to push a machine for home use that is one thing, when a business keeps trying to go on the cheap they are putting their operation and any customer data at risk.