I have installed Buildcraft Core and Buildcraft Builders only, however the recipes for the MJ consumer and producer are missing since they are still dependent of Buildcraft Energy as far as I can see in the source code

oh... yeah. I only search+replaced through the src folder and forgot the assets. Fix is coming.

Fixed in 1.3.3
Awaiting curseforge approval right now. Available on curseforge and twitch.

Cool, and thanks for making our lives easier