Honestly it sounds to me like we are overthinking a solution to a problem that really doesn't exist, in a sense.
We don't need interchanges, street closures, etc.
Lets break down the root of the problem:
"LRT needs to stop at light"
Thats the only issue here, that a streetcar needs to stop at the intersection.
So, what do we want to solve"
"LRT doesnt need to stop at light"
Well, we always want to find the easiest solution to a problem, not the hardest.
The easiest solution is as such:
"Put signal priority in place that never allows Eglinton lights to turn red when LRT is X distance from lights, and turn Eglinton lights green if red and LRT approaching"
This can all be solved by proper signal priority.
This is 100% a government legislation and bureaucracy issue. We need to change the structure of our city government so that the Toronto Transportation Authority cannot be making decisions that negatively affect a provincial project.
Where is the province on this? They seem to be ok with screwing with our wards and trying to steal our subway system. But when something actually negatively affects us here, where are they?