Quantity   Component name
1 × Psion Organiser II I'm using the 32K XP model (sometimes also called the LA) introduced in 1987. There was a cheaper model with 8K RAM called the CM, and a 'deluxe' model called the LZ which was introduced in 1989 and had a 4-line display. Ooh, fancy!
1 × Psion Comms Link A remarkably hard-to-find Organiser peripheral. Vintage units from the 80s have an RS232 port, modern units have a USB.
1 × Raspberry Pi 3/4/Zero W, or any modern laptop with Bluetooth
1 × HC06 Bluetooth Chip Readily available off eBay. HC05s will probably work as well (no guarantees!)