Okay... I understand what you are saying now.Why don't you run 2" pipe from the ejector (I assume it's 2" since that's all it would need to be) into your tee? Not directly into the tee since you need to be 10 pipe diameters away from the base of the stack.
So, is there a limit to how far you can run a horizontal section of 2" ejector pump discharge pipe?
Due to other branch drains that connect to the main drain pipe (see image below), I wouldn't be able to connect the 2" ejector pump pipe as stated above due to the "10 pipe diameter distance" rule... but once I get beyond any drain connections that would interfere with the "10 pipe diameter distance" rule, your suggestion is certainly a possibility. That would reduce the amount of 4" pipe that would be needed.
Note: The rubber no-hub connectors are only temporary until this bathroom remodel is complete and the 3" main drain pipe is replaced with 4" drain pipe.
Another reason I am changing out some of the existing PVC drain pipe is that I believe the wrong connectors were used to connect the 2 branch drains into the main drain. SanTee's (on their back) were used instead of a wye connector with the appropriate elbows. And the branch drain to the far right is not vented (tub drain will gurgle after a few toilet flushes). All of this work was done back in 2008 by a professional licensed plumber that was working for a well know licensed contractor that we hired to remodel our hallway bathroom. At the time, I did not know any better to question their work... but I am going to fix all of this prior to finishing the basement ceiling with drywall.