We are not a Mercere House per se. We have a Mercere House (Lodge & Vault) that rents and occupies a portion of the covenant. A deal set up by a previous generation and not part of the original covenant. Trying to maintain & expand this arrangement is part of a current storythread, Covention of Redcaps.
If the idea is for a Redcap, then go for it all out 
But there is an overabundance of Mercere magi in this saga already. I will give you a pass if you stick with one concept and play it out through the end. No more shifting around and changing ideas 
I will not give a pass for another random idea that will be discarded quickly. What happened to the Fire Caster guy? I liked that concept.