Does TurboTax have professional accountants or support line I could talk with to help file the amended returns and 3115?
Again, since you will have a change in accounting method, amending is not an option. Per IRS Publication 946 at https://www.irs.gov/pub/irs-prior/p946--2019.pdf on page 14:
The following are examples of a change in method of accounting for depreciation.
• A change from an impermissible method of determining depreciation for depreciable property, if the imper-
missible method was used in two or more consecutively filed tax returns.
• A change in the treatment of an asset from nondepreciable to depreciable or vice versa
