Short form:
Tweak the tuning with four custom offsets.
Use a 6:2/3:1 curve and match the following offsets.
A4(3) = E6(1)
E6(3) = B7(1)
D3(3) = 440
D2(6) = 440
Here's how, on my iPad:
Set TL default octave styles to 6:2 bass and 3:1 treble.
Measure.
1. Match E6(1) to A4(3).
Select A4, which is set at Fundamental.
Slide finger across the spectrum display from left to right twice. This should change the partial displayed to 3rd partial.
Note the frequency. On my piano it is 1324.86.
Change to note E6(Fundamental) and note the frequency. On my iPad it is 1323.78.
Slide finger across the phase display to match the frequencies. Set "Allow offset adjust?" to Yes.
Fix this new custom offset: drag from the upper right (Offset) to the note name in the center of the screen. "Allow transfer of offset?" = Yes. This becomes a red target mark on the tuning curve.
2. Match B7(1) to E6(3).
Select E6, which is set to Fundamental. (Already selected.)
Slide finger across the spectrum display from left to right twice. This should change the partial displayed to 3rd partial.
Note the frequency, in my case 4024.54.
Change to note B7(1) and note the frequency, in my case 4028.80. Fix this new offset: drag from the upper right (Offset) to the note name in the center of the screen. "Allow transfer of offset?" = Yes.
3. Set D3(3) to 440.00, using the same procedure.
4. Set D2(6) to 440.00, ditto.
Go into the tuning curve, full manual mode, and massage the curve until it fits all four red marks.
Now test it. Tune D1, D2, D3, A4, E6, and B7.
(Have not investigated whether the measure sequence should be adjusted to optimize the results. Consider measuring D1, D2, D3, A4, E6, B7.)