Modeling Help | Adjustments through Close / Y1

Bit of a specific question / topic, but I looked around the forums and didn't see anything close to helping me. I don't know if getting an answer will help me that much on this rep so I'm probably adding more so out of curiosity on if I'm just dumb or doing something wrong. 

As context, let's say I'm looking at a deal where the fiscal ends in October, transaction would close in July (if we have enough conviction), and the QoE is dated April. 

As I go through the modeling exercise, I'm reminded that one of the things that I struggle the most with in this job is developing a view of EBITDA at transaction close and fiscal year end after accounting for any adjustments that we'll be rejecting. More specifically, let's say management has XYZ synergies as an addback in the LTM period and expects it to continue through year-end, however we're not accepting the addback / think it's BS. My principals / IC usually want that to be reflected in our model as well (i.e., 2026B should come in less than management's forecast to account for our bearish view on adjustments). However, this gets pretty challenging when you don't have the monthly view provided by the bankers and are guesstimating how adjustments will roll off and how they map across specific line items in the P&L. Or at least it is for me. 

I don't think this is where i should be spending time but our IC focuses on adjustment roll off and first-year / budget projections a lot. Wondering if any people have any tips on this type of exercise?