The 5-pin connector is likely for a hall sensor, which isn't used since there's no pedal assist. The 3-wire connector is for the throttle signal.
You can get an LCD display with the older style connector and it should work with the 5-pin connector. Then, get a new throttle that connects to the...
Hi! Congrats on the new Electra Vale GO EQ S bikes! Sorry to hear your insurance company doesn't cover them under your existing policies. Have you considered reaching out to specialized e-bike insurance providers like Velosurance, Ebike Insurance, or CycleInsurance?
Unfortunately, I didn't just remove the battery, but the entire power pack, including the controller and throttle controller, to make it plane safe. So, I'll need to start from scratch. Your advice has given me a good starting point