i consider it more dangerous to float the secondary and risk line voltage on the radio and coax. worry about 1 milliamp later
That is a Straw-man argument and absence of any facts. As a ham you should know and follow electrical codes as it pertains to the hobby. Code requires you to bond the coax and radio chassis to ground using a 6 AWG conductor all the way back to the AC Service Ground, the exact same place the #14 AWG green wire ground in the AC power cord and your house wiring go too.
As I have said before, you prefer to use the 14 AWG in the AC power cord rather than a dedicated 6 AWG going to the exact same spot. Both work, however one is better than the other. 6 AWG is a much larger conductor with significantly lower power frequency impedance capable on conducting a lot more current than a 14 AWG. Using a dedicated #6 AWG also isolates you from the AC system which is exactly what you want to do. Two undeniable facts.
Here is another fact that has escaped your attention. A DC PS output would NOT BE FLOATING if you remove the bonding jumper inside the PS as you claim. Your 12-volt
transceiver chassis is solidly bonded to the DC Negative circuit . When you bond the radio chassis to ground as
required by code, the DC Negative is
GROUNDED and not Floating. That is the crux of the problem you keep ignoring or do not know. If you bond DC Negative twice, you put Ground in parallel with DC Negative (the Neutral conductor in DC systems). Electrical codes do not permit you to bond a neutral circuit conductor twice because it defeats the purpose of having a ground conductor. You force normal load currents onto equipment grounds. You no longer have a Ground, you have two negative circuit conductors allowing voltage to be present on the radio chassis. Remove the jumper in the power supply and all that goes away. There is no code or equipment requirement for a 12-volt system to be a Grounded System. Code requires all chassis and enclosures to be Grounded, but not the System. A 12 volt system can Float or be Grounded.
Why do you think manufactures place a Ground Terminal on the back of the radio with a WARNING label, and instructions how to use it. Your radio equipment is Hard Wired rather than plug-n-cord with ground. Electrical codes see all your radio toys same as a light fixture, electric oven, cook-top, central air conditioning, or an electric water heater all being Hard Wired devices. Hard wired devices have more restrictions and requirements beyond plug-n-cord. They are to be installed and maintained by qualified personnel. One of the very fist requirements is for the device to be SOLIDLY GROUNDED by approved means. It requires the equipment ground to be securely fastened, and guarded against accidental disconnect. That is what the Ground Terminal is provided for. A coax is not Ground and cannot be used as such because it is considered a removable connection. Now look at the rest of your radio toys, especially the passive devices like a SWR Bridge, Antenna Tuner, and Coax Switch. Now you know what that Ground Terminal is for. It enables you to easily comply with electrical codes.