We are trying to get an application to work within the new Lightning Experience. This is a traditional desktop/browser application. In the application, the standard Opportunity object has several custom sObjects that are master/detail and are related lists on the layout. For one of them the absence of checkboxes on the left side is a fatal problem to our normal workflow, so we plan to build a Lightning Component as a replacement grid for this, with checkboxes.
My question is about how to replace one of many related lists on the Opportunity layout. I have worked with the new Lightning App Builder Page Editor, but it does not seem to be able to do manipulate individual lists. The whole set of Related Lists can be dragged on and off of the layout, but individual ones cannot be changed. Is that correct?
Given that limitation, what would be a good strategy for replacing one related list out of several (lets say 5)? I am thinking that I need to replace all 5 grids, even the ones that are OK without checkboxes, because the new Page Editor doesn't let me separate the one that needs checkboxes from the other 4.
Any better ideas?