Addon Update
Added 2021-04-03 20:01:30 +0000 UTCI updated Lev Tools, now you can set denoising manually, so the sample buttons don't affect it. If you hit Test render the image will be noisy but it's way faster than with denoising, and it's enugh to check if everything is in the scene or not.
Download the addon from the attachment.
Made with Serpens. (Affiliate link)