My mind, body and soul are too deviant to help you with procedures, and I am actually using reduction instead.
I will offer you some viewpoints I would consider...
Healthy, Workable, Likable, Fitting... Natural. (yup, against the "people problem / drug solution" thing myself)
There are bodybuilders who will pump anything into them just to look big, then there are martial artists who develop a body that will facilitate the artform they wish to employ...
Regardless of size, I would reccomend you take the latter path. If you only want a (possibly damaged) balloon dick, just try getting a prosthetic that slides over yours, or just holding a large dildo between your legs
Advice:
Make something that is right for it's purpose.