If the inheritance is necessary (eg, for data inheritance, etc..) why not add a snippet like the following:

package B;

foreach $autoload_handled ( 'doit', 'dothis', 'dothat' ) {
  \&{ $autoload_handled } = \&AUTOLOAD;
}
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Sorry, I'm not sure if that exact code will work; I'm still learning about subroutine handling in classes, sub-references, etc... But the idea is there, at least. Hope that helps?