Don't know if I'd really want to invest a mid-first rounder in a 6'8" mountain of a tackle just to try to convert him to guard, honestly. Seems like really iffy process.
If you want a guard draft a guard it’s different skill sets between the 2 positions If you want to do a position conversion I can see doing it with a late rd defensive lineman and converting to OL which is something the Cowboys started back in the 70s. The Seahawks had done this with JR Sweezy who turned out to be a good run blocker but weak pass blocker
I think they look hard @ Vorhees USC G, he is a bulldozer of a guard, with tackle experience in case needed in a pinch, same with Cooper Beebe Kstate G. Jarrett Patterson ND G/C is another i think they keep an eye on.