so far it's possible to change game content, i.e. insert items and such. What you want is engine related. I prefer the bars as they are in an rpg but to have somewhat solution to your request an external tool could display those values. It's needs to be constructed like cheatengine for example, to find the experience value then display it (not in game but some kinda overlay window). Or, even simpler, if you provided the pointer address of experience for example using cheat engine only the displaying part would be left. But those pointers may change especially in times of ASLR. (Too busy atm but I'll keep your request in mind.)