Passing parameter to process (when called process action with process start form) as Embedded Interfaces on External (Non-Appian) site

No answers on any of these posts:

Do we know if there is any recommended way of passing the process model parameters when exposing the process with process start form as Embedded Interfaces?

(Not looking for any webAPI based approach, as there is a risk of race condition always, hence said any "recommended" way?)

Thanks!

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