BYOD support

I have a shot at a firm that I feel like could be a community beachhead since they are very popular and active in the area, so I want to get in with them if I can. They have 23 agents, but all agents use their own machines. They have no AD. Their complaint was a slow, very old firewall causing a bottleneck, and their current support arrangement is break/fix.

How do you guys handle byod in this scenario? I don't currently offer AYCE, just a remote monitoring and services stack with a block of hours.

Thanks in advance!

Edit: It does sound like they are cheap from the post, but I didn't do a good job of explaining. They just haven't been sold anything. They have 100Mb FTTP and I'm putting in a GE Sonicwall with CGSS. They asked if I wanted to put in a server for AD and fileshare, but the company only actually owns 4 PCs so I'm not sure they would be necessary.

They are BYOD mostly because the agents are like partners and they have just always allowed them to buy and use what they wanted.