Ouch, you had to say that. 
But since you did lets chase this rabbit, the only 'local' option would be the Logitech Harmony Hub Driver.
Even with Mira your communication path is:
Remote -> Harmony Hub -> Harmony Cloud -> SmartThings Cloud -> SmartThings Hub -> Hubitat Hub -> Device
With the Logitech driver your communication path is:
Remote -> Harmony Hub -> Hubitat Hub -> Device
The trick with the Logitech driver is you need to assign each button a UUID. The only way todo that is connecting the Harmony Cloud to the SmartThings Cloud and assigning devices (step 6). After that is completed - the Harmony Cloud does nothing.
SO the best'est' option IMHO is to build 'virtual cloud dimmers' and then connect them to Harmony, then use the Logitech driver and assign the UUIDs from the 'virtual cloud dimmers' to the button definitions. In transparency this is what I do. (I did use HubiThings to build the virtual cloud dimmers, but you can do this via the SmartThings API or the ST Android app)
I have a BIG mental problem with the long term security of SmartThings and community Edge drivers. That is just a future security incident waiting to happen. A couple of folks in this thread know my soapbox, but since I have been involved now in 4 major security incidents at work in 3 weeks which will take months to completely block, figured I should say it again.
