I was recently going through different methods of converting RF to MJ and noticed that the kinesis pipe doesn't do this... maybe other forms of energy transmutation could be mekanism's energy cells or maybe just make it to where you don't need energy "pipe" to connect RF machines/energy cells to BC machines. It is a pain to convert RF to MJ but I can understand if you don't want to make this happen.

In 6.2.x there is no more MJ. Please consider updating.

There isn't MJ in 6.1 either

BuildCraft 6.1.2+ uses RF, no need to convert.