Flammability of alternative refrigerants really doesn't confront me. R134 is flammable with a surprisingly low autoignition temp at pressures much lower than a/c systems typically run. R12 while not extremely flammable will burn and releases phosgene gas in the process. Everything in life has risks, and anyone willing to strap into a metal cage with large quantities of highly flammable hydrocarbons on board assumes a certain risk.

The regulations I guarantee you are political $$$ in nature. R12 wasn't replaced by 134A because it's good for you. R134a is a known carcinogen, linked with testicular cancer. Every time I get in a car with a leaking evaporator I exhale and hold it, grab my nuts, and try to get the windows down and aired out before I black out. Then I thank the government for looking out for my best interests.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff