There was mention of a Mac portable keyboard replacement, article here;
not certain of what detail may apply to your specific build model issue:
• Keyboard Service Program for MacBook, MacBook Air, and MacBook Pro - Apple Support
https://support.apple.com/keyboard-service-program-for-mac-notebooks
Some third-party sites may show certain keys that could (or not) be replaced
by an end-user or acquired from their site for independent repairs. Look here:
• Apple Macbook Air Replacement Keys | Keyboard Keys | Keypad Keys
https://www.replacementlaptopkeys.com/macbook-air/
These kinds of key replacement often include small wear items; however
each has whatever parts for each key face and underneath parts in sets.
Includes key part images, & on-site video to show how these are replaced.
Worth at least some effort to determine which key parts and how they work.
• Apple Repair and Repair Status Check - Apple Support
https://support.apple.com/repair
You may see if the repair can be mailed in for correct service.
They could offer to send you a return box, in some instances.
Take care & good luck!🌞🎣