I think in instances where life saving measures are needed, the Quran will allow a muslim to accept a pig's kidney in order to live. The arbitrary standards are set by whatever scholars a muslim chooses to follow, and the adherence to the core tenants of Islam only applies when convenient. The modern world of medicine is no match for ancient Islam.

Anyway, I predicted a lot of this would happen in the future, reusing animal components and transplanting them in humans. No ethical concerns as far as I'm aware, except for maybe a few rabid vegans.