Recent releases of the various browsers have a kill switch programmed in. The versions of Flash for the past six months or so have a kill switch built in. If you use versions of each from before mid-2020, and disabled updates for both, you should be fine, I think.

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1976 240D [W115.117/616.916] (acq 11Jun76)
1990 MB 300D 2.5 Turbo [W124.128/602.962] (acq 4Sep15)
1991 SL250D (ex-300SL-24) [R129.061/OM602.962/722.618, was M104.981] (acq 25May12, converted to diesel)
1993 Jeep Cherokee [XJ] (acq 12Apr14)
2013 GLK250 BlueTec 4MATIC [X204.904/651.912] (acq 24Jan26)