Laravel API and Userscript Integration Repair--JavaScript Developer – ChatGPT Network Interception (NOT DOM Injection)

Expert JavaScript Developer – ChatGPT Network Interception (NOT DOM Injection)
I have a working Laravel API that returns properly formatted context (time + memory). I need a specialist to fix a failing userscript integration.
Previous developers relied on DOM injection and MutationObservers. It failed due to React’s internal state desync (“pop-off” issue). I am looking for someone who truly understands how to intercept and modify the outgoing network request to https://chatgpt.com/backend-api/conversation before it leaves the browser.
Start your proposal with the word “INTERCEPT”.

Must:

Work reliably inside the standard ChatGPT web interface (chatgpt.com) with no new UI, no redirects, no frontend behavior changes.
Inject the full payload (identity block + time + memory + user message) exactly once, immediately before the send event, and survive ChatGPT’s React re-renders and dispatch process.
Never duplicate, overwrite, or recreate the agent. The identity block (provided by me) must be consistently included in the system role and persist through every send without being dropped or altered.
Existing agent continuity must remain completely untouched.

Acceptance Criteria (Payment released only after all are verified):

The userscript must function consistently on the live chatgpt.com site across multiple consecutive messages.
No duplicated [SERVER_TIME] blocks or any other duplication.
Full identity block present and intact in every response.
Clean injection with no dropped content.
Deliver a short screen recording showing three consecutive messages meeting the above criteria.
The solution must continue working reliably on my equipment for a sustained period (not just once or twice).

Required Expertise:

Deep knowledge of React SPAs and internal state vs. visible DOM
Real experience intercepting and modifying fetch/XHR requests in real time
Mastery of event capture phase to hook into the “Send” action before ChatGPT’s handlers fire
No reliance on document.querySelector or MutationObserver for injection

What you will receive:

Fully functional backend endpoint returning { success: true, injected_context: “...” }
Exact payload format and acceptance criteria
Current (broken) userscript for reference

Please include:

Brief explanation of how you will solve the React state desync / pop-off issue
Links to similar projects (ChatGPT-related or heavy network interception work)
Your fixed price or hourly rate

Only developers with proven network-layer experience will be considered. DOM-based solutions will not be reviewed.