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Or you could go with https://adoptopenjdk.net/ and provide the option to choose between JVMs.
OpenJDK 8 (LTS) w/ Hotspot
https://adoptopenjdk.net/releases.html?variant=openjdk8&jvmVariant=hotspot#x64_win
OpenJDK 8 (LTS) w/ OpenJ9
https://adoptopenjdk.net/releases.html?variant=openjdk8&jvmVariant=openj9#x64_win

OpenJDK 11 should have installers posted soon according to:
https://github.com/AdoptOpenJDK/openjdk-installer/issues/27