I think you're looking for the Mullvad Browser[0]. They work directly with Tor and are doing exactly what you're asking for.
And no, you do not need to use Mullvad VPN
I cannot currently test the Mullvad browser, can you tell us whether it supports Ublock Origin or another competent ad-blocker (is there even another?). Because, frankly the ad-blocker is a make-or-break for me.
Yes! I wrote to the Tor Project and that's exactly what they replied! Installed already. Thank you.