iPad + HDMI input dongle can be an HDMI monitor. iPad + GetConsole app + Redpark [1] USB-serial cable = serial console. The missing piece is USB keyboard emulation, but serial->arduino [2] might work.
iPad + $40 RISC-V piKVM-alike [3] is another option.
iPad + $40 RISC-V piKVM-alike [3] is another option.