short answer: no
long answer: yes, there are some very niche sites that do import paywalled content, but those sites are not as public as Kemono is, meaning less people are going to share in total. These sites mostly focus on non-game content. If there were to be an alternative that does also import Patreon content, they would be far too niche to have this game. On top of all that, Kemono is not updating Patreon due to the fact that the new captcha they upgraded to has been difficult to automate meaning until they figure it out, or someone else who is willing to advertise their importing site figures it out there is almost no chance that an alternative like kemono will arise.