Any RF modulator for $20-30 can "bypass " Macrovision. Many people that have TV's that do not have RCA inputs use them when hooking up DVD players or video game systems. I am not sure if Macrovision protection is used on the coaxial input of VCR's. What you would need to do is use one VCR to play the tape. Use the RCA output on the playing VCR to the RF modulator. Then use coaxial output of that to another VCR and set that recording VCR up for channel 3 or 4, whichever way you flip the switch on the RF moidulator. I'm not sure it will work, but it may be worth a try for you.
