Russ has explicitly written that yes, redefining v1 in terms of v2 is not only the way to go, but in the future it might help automatise the switch to v2 with t

Russ has explicitly written that yes, redefining v1 in terms of v2 is not only the way to go, but in the future it might help automatise the switch to v2 with the "go fix" command. See https://research.swtch.com/vgo-import https://research.swtch.com/vgo-import, section "Automatic API Updates".