Don't forget to enter settings and change the screen resolution from 480i to 480p. If you switch the Wii to 480p mode, they may work in an HDMI compatible manner. Output resolution: 720p / 1080p (whether the high resolution can be achieved depends on the input signal).
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XIKCU 1080P Full HD Wii To HDMI-compatible Converter Adapter Wii 2 3.5mm Jack Audio Video Cable 720P For PC HDTV Monitor Display
Aliexpress UK
If you switch to 480p mode they may work over HDMI. it can't be connected to the switch/splitter, only connect directly to the TV, monitor, projector. This adapter not support for Wii Mini.
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XIKCU HD 1080P Wii to HDMI-Compatible Converter Adapter Wii2 HDMI-Compatible Converter 3.5mm Audio for PC HDTV Monitor Display
Aliexpress UK
Small in Size: PORTHOLIC Wii to HDMI Adapter with size of 6 x 3 x 1.9cm, is small but powerful. It does not occupy any space on your table by hooking up the back of Wii. No more tangling cords, just one cable.
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1080P for Wii To HDMI-compatible Adapter Converter 3.5mm Audio For PC HDTV Monitor 720P Wii2 To HDMI WII2HDMI Converter Adapter
Aliexpress UK
The WII TO HDMI converter can output HDMI signals for direct connection to monitors/TVs/projectors! wii to hdmi HD converter: 1m. 1x wii to hdmi HD converter (1m). It uses a standard HDMI high-definition interface to connect to a TV or monitor, with a clarity, brightness and sharpness that is unmatched by previous analogue interfaces!
eBay
3.5mm Audio 1080P for Wii To HDMI-compatible Adapter Converter For PC HDTV Monitor 720P Wii2 To HDMI WII2HDMI Converter Adapter
Aliexpress UK
Don't forget to enter settings and change the screen resolution from 480i to 480p. If you switch the Wii to 480p mode, they may work in an HDMI compatible manner. Output resolution: 720p / 1080p (whether the high resolution can be achieved depends on the input signal).
eBay
Wii to HDMI -compatible Converter Adapter Wii2hdmi cable adapter for wii to HDTV Monitor
Aliexpress UK
Cable Length 150cm / 4.9ft. 1× Wii-to-HDMI Converter Cable (150cm). Input Interface Wii Multi-Out (Wii & Wii U). 100% driver-free! Connect Wii → HDMI display in 3 seconds Output Interface Standard HDMI (Type A).
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Wii to HDMI Converter Adapter Video Cable 1080P Male to Male Wii2HDMI Converter Plug and Play for Wii to HDTV Display
Aliexpress UK
Wii To HDMI-Compatible Converter 1080P Full HD Adapter Connector 3.5mm Video Audio for PC HDTV Monitor Wii2HDMI-Compatible. 1 x Wii to HDMI-Compatible Converter. Input: For Wii AV Connector. High quality, state of the art motion adaptive de-interlacing for 480i ,576i input.
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Full HD 1080P Wii To HDMI-Compatible Adapter Converter 3.5mm Audio For PC HDTV Monitor Wii2 To HDMI-Compatible Converter Adapter
Aliexpress UK
1x 1m HDMI Cable. Cable length: 1m. Supported HDMI output mode: Outputs purely digital HDMI video/audio signals. 1x Wii to HDMI Converter/Adapter. Input Connection: Wii AV Multi-Output. Outputs: HDMI port and 3.5mm stereo audio jack.
eBay
for Wii To HDMI-compatible Adapter Converter 3.5mm Audio For PC HDTV Monitor 1080P 720P Wii2 To HDMI WII2HDMI Converter Adapter
Aliexpress UK