>Please let me know if there's an easy and not too expensive way to turn the 1020 into a wireless one.
Hello,
One way would be to use a Wi-Fi-to-USB print server connected to the LaserJet 1020. Alternatively, an Ethernet-to-USB print server connected to an Ethernet LAN port of a Wi-Fi router (if the USB printer can be placed near that router). Such devices can be found, for example, from TP-Link and StarTech.
Another method could perhaps involve the old MacBook Pro, and let that computer share the printer. However, one disadvantage is that the MBP then must be on whenever you wish to print.
In any case, the printer driver question for the more modern Mac, running Big Sur, will have to be solved, somehow.