Rollable tokens also have the disadvantage (in non-Pro games) that players cannot resize them. If your DM is happy to shapeshift you, they can edit your token, (usually) resize it, then change the "Represents character" on the token to the correct sheet. This can all be automated with API, but is a pain doing it by hand mid-combat. If you don't change the linked character sheet, your token's HP and AC are going to be incorrect. I'd recommend sticking to the way you're doing it. If your DM arranges your beast form character sheets in a subfolder in the Journal, you can easily drag one to the canvas whenever you want to Wildshape. The only drawback is the need to leave your caster token somewhere to keep its entry on the Turn Tracker.