If anyone else in North America wants to take a crack at it and can't wait, here's my tentative shopping list based on
@A.L.'s list for the type 2 adapter and
@alexw's post about the North American adapter (optimized for shipping to Canada, probably some slightly different choices will be cheaper for shipping to the US). Selected options from the product page are shown in
bold.
Housing:
US $47.93 | feyree EV Charger Plug SAE J1772 Connector Type 1
16A
As far as I can tell, it includes a latch switch.
Switches and safety switches:
US $0.50 | Bimetal thermostat KSD301 0C~350C Temperature Switch Thermal Control
95C Degree
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US $1.67 + $1.61 shipping | 1sets 88 Series KUOYUH
15A overload overcurrent protector
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US $0.70 |
12mm fixed self-locking 100-240V Waterproof Metal Push Button Switch LED Light Momentary Latching Car Engine Power Switch
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Slightly smaller than the one
@A.L. posted. As far as I can tell, includes an o-ring and metal nut. Hopefully that makes a good enough watertight seal!
Resistors:
US $3.99 | 560pcs 56 Values 1/4W 5% Carbon Film Resistor Assorted Kit Set 1 ohm ~ 10M ohm Electronic lovers Resistor
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Something in here will work to make 500 ohms and 75 ohms depending on the latch switch.
Voltage indicator:
US $1.02 | Mini Digital Voltmeter 22mm Round AC 60-500V Volt Voltage Tester Meter Monitor Power LED Indicator Pilot Lamp Light Display
This probably won't fit, but hey, worth spending a buck in case it does. Seems to include a rubber washer and plastic nut. A metal M22 might be worth the upgrade.
Heat shrink tubing:
US $1.67+$1.82+$2.77 | 10 Meter Waterproof Heat Shrink Tube Data Line Thicken Insulating Sleeve Universal Wire Protection Heat-shrinkable Sleeve
3mm, 4mm and 8mm
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I've never used heat shrink tubing so I have no idea what I need and ordered a bunch.
Wire:
US $2.90 | Ultra Soft Silicone Rubber Cable
2 Cores Insulated Flexible Copper High Temperature Wire
2 meters of 2.5mm^2
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I don't know if there will be setscrews in the socket and plug housing to secure this.
I imagine some solid core wire without a sheath would be good in the plug, but I didn't quickly find anything. Instead, I got this:
US $1.05+$2.79 | Copper Wire Silicone Rubber Cable Super Soft
14 and 20 AWG 2Pins Flexible DIY LED Lamp Connector Black Red
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Outlet:
US $15.84 | Outdoor Mobile Industrial Socket Box MCB RCBO 110V 16A Waterproof Switching Power Control Box Wall Installation IP54
2 socket box, internal wiring, US/China
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I'll update when I have it all here and have taken a shot at building something, but since the shipping time on some components is 2 months, figured I'd share my list now.