Ya, I just go back to the risk. Even if you're successful it could cost you months of time and thousands of dollars. I also agree with one of the above points discussing the "generalist" aspect of normal law.
As a patent agent you are not allowed to practice law. But you are qualified to practice a portion of patent law. By simply saying "law" and not qualifying it more thoroughly the fact finder may very easily find that statement misleading. One thing they'll likely look to is how simple it would have been for you to qualify it more clearly. Since it would be relatively easy for you to do that and then you choose not to could possibly indicate intent. Further, the mere fact that you are having this conversation shows your intent. Its not about whether an informed person would be misled. You have to put yourself in the shoes of the uninformed client. A court would likely find that the use of the word "Law" in the setting you are suggesting would lead people to believe its a law firm capable of practicing other types of law.
This does have material consequences too. Say for example someone who has invention comes to you for advice. They ask you whether or not you think its a good idea to patent the invention. Depending on the specifics of the conversation you might not even be able to answer that question. No matter what your answer you are advising, either impliedly or expressly, on the issue of trade secret law.
So the truth is you would only want to represent savvy individuals who know they want a patent in the first place. And those individuals are probably going to know that patent agents can practice portions of patent law. So, in reality indicating that you're an agent and not an attorney isn't going to hurt you. From the Bar's perspective if it is hurting you not to use your proposed title then those clients that you would pick up by using your title are probably by definition being misled.
To get a better feeling for it you need to ask yourself why you're wanting to use your version. Its because you hope to pick up some of those customers who might be unaware that an agent can prosecute and draft patent applications. But anyone who falls in that class is unlikely to then know that a patent agent can't practice trade secret law. Well, if a person doesn't know that then you really can't represent them anyway, as you couldn't advise them in the first place as to whether a patent was better for them than protecting their idea with state trade secret law.
Anyway, again, my advice is just "play it safe."