In my 22 years of program I have sponsored many people. Some of them worked a good program and also were getting outside therapy. Those who did both were dynamite to work with because they made such great progress. I am one who who did both. I am thankful that I have been given so much more powerful serenity.
That is not to imply that I have in any sense that I do not have lots of room to grow. For example my ability to move from friendship to romance with a woman is not good by any standard. There is no part of my personality that is anything like well.
Also, I am not giving advice to you. I support all of you doing it your way. I am just offering my experience, strength, and hope.