Strip method override search parameter

[aphilas]

Based on #1046 and the docs I can write a form as such:

<!-- +page.svelte -->
<form method="POST" action="/alarms/{id}?_method=PATCH">
<!-- rest of form -->
</form>

with the following action:

// +page.server.ts
export const PATCH: Action = async ({ request }) => {
	// patch alarm in db
}

After the form is submitted the page url is /alarms/some-id?_method=PATCH.

This errors out with live reload, since method overrides are not permitted with the GET method. Reloading the page yields the same error.

Currently I have the following function to remove the _method search parameter:

<!-- +page.svelte -->
<script>
    onMount(() => {
		const url = new URL(window.location.href)
		url.searchParams.delete('_method')
		window.history.replaceState({}, document.title, url.toString())
	})
</script>

Is there a better way to strip the parameter, possibly server side?

I have tried:

// +page.server.ts
export const PATCH: Action = async ({ request }) => {
    return { location: '/alarms/some-id' }
}

and:

<!-- +page.svelte -->
<form method="POST" action="/alarms/{id}">
    <input type="text" name="method" value="PATCH">
    <!-- rest of form -->
</form>

Am I missing something?

P.S. I have briefly skimmed through #5875 and #3533, so I am aware things may change soon.
ETA: Add <form> under "I have tried".