Trying to attach to a PC, running Windows / Vista primarily, but have also got another network with a VAXstation (running VMS 7.3), an Indigo2 (IRIX 6.5.9), an Ultra 60 (Solaris 10u6), an IBM 43P-140 (AIX5.1), a Sparc 5 (NeXTSTEP 3.3) and a Alpha Personal Workstation again running VMS7.3. All support SLIP afaik...?

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If you already have working versions of SLIP over tty/rs232 then use those.

I would choose the UNIX box that implements SLIP and is the quietest and physically nearest the SE/30 for the serial cable to reach. Then start up "cu" or similar on the box and confirm they are both talking to each other, eg you can log into one from the other.

Then allocate unique IP addresses for either end of the SLIP link. Then start looking at slattach on the two systems.

Although many support SLIP, A/UX, for example, does not support SLIP on a pseudo-terminal, it has to be a real tty port.