Font Modification

I know this get's brought up a lot here. 

Working on a project to modify a font in Illustrator(add on serifs) for a pitch proposal, would like to know if this compromises the Font-Bureau EULA. Source https://store.typenetwork.com/cart/eula/font-bureau

We are willing to get in contact with Font-Bureau to ask for an the rights. Whats the best approach? in this situation.