I would never tell people from my chair connected to the internet to modify a pressure regulator to deliver propane to a device that was no longer regulated. I can say that with knowledge of how a cheap pressure regulator works, It is possible using small tools to defeat the regulating function. This can be done for free, assuming you have appropriate tools, It will allow you to gauge the performance of your "non RV" propane device before you go any further with adapters and such.
Keep in mind that in many situations the pressure regulator is also the temperature control device. Defeating the regulator may also defeat the control. In the past I've been able to regulate the temperature of my grill by partly closing the shut-off valve at the quick disconnect on my RV. Good luck and be safe.