For shaped, you run !shaped-config and where you set the default there is an option to set it on all characters. You can change sheets any time, but that will likely cause the need to open every sheet and do an import (if switching to shaped). You can create a new Game, use a module, and specify the shaped sheet. You'll basically have to do an import each time you open a sheet (which isn't too bad). If you want to continue using the OGL sheet, you can probably use this little API script to set the output to public for rolls and show bar3 (the hit points): on('ready',function(){
"use strict";
_.each(findObjs({type:'attribute',name:'wtype'}),(a)=>{a.set({current: ''});});
_.each(findObjs({type:'graphic',subtype:'token',isdrawing:false}),(t)=>{t.set({showplayers_bar1:true});});
});
Just throw that in as an API script and start up the Game. This will only adjust the tokens that are on a map, so dragging new tokens out you'd have to fix the bar permissions again. You can also use TokenMod to update any creatures' default token by selecting them and doing: !token-mod --set defaulttoken