Custom Roles for Client Side - Facebook

Howdy people!

Hoping that someone here can shed some light on a small problem I cannot solve...

I have a case with one Client where I do not want them to see the ad/boosted post spend in Facebook insights. The Client's current role is Editor. The Client must maintain access to manage the page in respect of comments/messages. Reading on various facebook forums it seems that roles cannot be customized at all and all role types will keep having access to full insights...Is that indeed the case?

If so maybe someone knows a third party app that offers the same functionality to the Client but is at the same time customization so as to stop them from accessing the actual spend?

Any comments/tips from this fine community greatly appreciated! Thanks in advance

I do not think that FB Pages have such a Role.. a person who have Authorization to sent messages on behalf of the page will see boosted details also..