4 of 4 added 96 characters in body

Perl 6, 34 32 30 bytes

Thanks to nwellnhof for -2 bytes through the use of the o operator to combine functions

{S/.//}o{base :36(1~\$_)+1: 36}


Try it online!

Function that converts the argument to base 36, adds 1, converts back and then formats it. Now uses the same tactic as Adnan's answer to preserve the leading zeroes.