Careful! This is a lot stricter than you may want it to be:
UNIVERSAL::isa($ref,'CODE') or $ref = \&{$h -> {'function'}};
Setting aside the fact that UNIVERSAL::isa() is a method and not a function, you're disallowing blessed coderefs (perhaps unnecessarily) and you're forbidding overloading (definitely unnecessarily).
If you really need to check that the underlying reference is to a subroutine, use Scalar::Util's reftype(). If all you want to do is check that you can use something as a subroutine reference appropriately, use:
if ( eval { defined &$ref } ) { ... };
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