i think its possible you get the like 2015 or 2013 for example mobile client and you modify some code in there and now the webpage is austiblox instead of roblox and opening a game uses austiblox instead of roblox
Every update that releases to PC will need need to be ported to mobile and the mobile players will have to manually download them again. Theres a bunch of other problems but im just not gonna list them.