How do you handle 3rd party(Guzzle) namespace conflicts in modules?

I am implementing a payment method module, for a payment provider company.

That company has a proprietary php-sdk for all the actions around the payment requests. That sdk uses guzzlehttp/guzzle.

I have required the sdk in the magento module, which in turns has guzzle as its own dependency and so it requires that and everything else.

Now when I run php bin/magento setup:di:compile I get the error that ClientTrait is already declared, because I found Guzzle being installed already in the Magento core.

The solution seems to be php-scoper but I failed to make it work and also failed to find any help online or examples of other modules who have done this.

The steps I have taken are:

Install php-scoper
Run `php-scoper add-prefix –prefix=[our unique prefix] vendor/
Run php bin/magento setup:di:compile
Encounter error: Interface "[Our Prefix]GuzzleHttpBodySummarizerInterface" not found

The interface is there:

/guzzlehttp/guzzle/src/BodySummarizerInterface.php:

<?php

namespace [Prefix]GuzzleHttp;

use [Prefix]PsrHttpMessageMessageInterface;
/** @internal */
interface BodySummarizerInterface
{
    /**
     * Returns a summarized message body.
     */
    public function summarize(MessageInterface $message) : ?string;
}

So my question is, what are the steps I need to follow in order to load the sdk that already contains the Guzzle client and is currently conflicting with another Guzzle installation?