I would immediately upgrade to a newer DX7 V? if Arturia provided an option to choose how the use classic FM frequency RATIOs between Carriers and Operators.
You could keep the existing "arturia" system and provide a software select switch to permit input of the classic/standard Ratio values that Yamaha keyboards and mostly all other DX software emulations utilize (FM8, DEX and others). Essentially, this could be an input script that calculates the "converts" into the "expected arturia values" when providing well-known defacto standard frequency values/ratios.
So, instead of asking for NEW synths, why not improve the ones we own based on customer feature requests? I would happily pay for an upgrade to a newer DX7 version knowing that when it comes to FM sound design I don't have to run all the ratios through a spreadsheet to calculate the 'hybrid Arturia" value.
Let me guess, this has already been fixed and all I have to do is upgrade to the new DX version
Gratefully.