Resource Forest, Account Forest - Exchange Removal questions.

Hey Guys, 

This is a strange one i have never come across before so please assist if you can. At this time i want to better understand what needs to be done to remove the Resource Forest (de-couple it from the account forest) and what pitfalls might be encountered. 

Here is the scenario: 

1)  Customer has Hybrid setup between the resource forest/account forest. And connected to office 365. Did not use HCW to setup hybrid, set it up manually.

2)  Mailboxes have all been migrated from the Resource Forest to Office 365.

3) Has their own tenant, has a 2 forests added (to ad connect), account and resource, account forest data provides account attributes, resource provide exchange attributes.

4) All mailboxes are in the cloud, Customer also has Skype for Business On-Prem. 

Question: Customer wants to remove their resource forest, while continuing to keep their account forest and wants to be able to "Manage" user objects using an exchange server in the account forest, and also keep ad connect. 

I am not sure how best to approach this, while i have worked with Resource forests in the past, its been a while. 

I have seen several links that cover this, but nothing explains whats going on what could go wrong etc. 

Any ideas? 

Thanks, 

Robert 

TonyRedmond if you could review the question for me please. I just wanted to get some input on it, not asking you to fix anything. thanks in advance.