Other names of the accordion control are details disclosure elements, disclosure control,
disclosure widget, collapsible sections, expandable sections.

This is described in the Web Accessibility Initiative – Accessible Rich Internet Applications (WAI-ARIA) Authoring Practices 1.1 document https://www.w3.org/TR/wai-aria-practices-1.1/#disclosure :

Keyboard Interaction
When the disclosure control has focus:

• Enter: activates the disclosure control and toggles the visibility of the disclosure content.

• Space: activates the disclosure control and toggles the visibility of the disclosure content.

Others also use Enter and Space:
https://www.scottohara.me/blog/2018/09/03/details-and-summary.html
https://design-patterns.tink.uk/disclosure1/index.html

Therefore I propose to keep the existing Enter and Space keyboard navigation for the accordion control.