Hi Prof. Andy,
I understand its complex for on-prem. Instead of you tweaking the product to be compatible for every other company why not let the companies to be compatible with your standard. I understand it's easier to be said than done. Especially in the early innings.
PS: I really want to try OtterTune but I don't have AWS RDS. I have on-prem (aka Raspberry Pi) and I will change everything the way you want to have OtterTune run on my Raspberry Pi.