I'm currently looking into fabricating my own dual or-combiner to go with my muxlicer.
I've made some of those this year, funny enough, also one for my Muxlicer;
It is an open source project, check it out here.
In essence the outs set al negative voltages to zero and only the momentary highest voltage will pass; making it ideal for gate combining.
For some reason the Low Gain Electronics Short Bus has seven inputs, I think that is for creative purposes but I like me eight of 'em.