Construction for ONE SHOT (NG 0) without using GLITCH's!!!

Good afternoon guys, I wanted to ask if anyone knows or has managed to do the ONE SHOT challenge, on the first day, without the use of any ridiculously extensive glitch's or farm's?

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I followed Bushy's video on YouTube (https://www.youtube.com/watch?v=hX7xcxpxHhU), he had a very interesting journey. He practically used the entire run of the Giant-Crushing Hammer. But the Radagon and the Elden Beast were the problem, he needed to UPGRADE some stats to the maximum (Mind, Strength and Intelligence), with the character remaining at level 290 (and in the first journey, if you do practically everything in the game , you will end up around level 160 to 180). In the end he also used 2 weapons, one of Strength (Giant-Crushing Hammer) and one of Intelligence (Lusat's Stone Staff + Magic: Azur's Comet), which is unfeasible, since in these runs it is only possible to use one thing per time, or you can change the complete build at Rennala, at most.

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If anyone has any ideas, I would be very grateful.