I’m kind of skeptical on the allure of the "Dumble" amp. All of the real ones were manufactured to fit one specific individual so there’s not really an easy to define "Dumble sound." I’m not entirely sure what things like this or the UA Enigmatic are even trying to be.
Although I do like the model of the Grammatico GSG in the Helix. It’s very tweakable and basically has a built in OD pedal to assign to a foot switch, saving DSP.