> Is it possible to open a hotlink to a single element in an ODB array?

Not possible.

> sprintf(element, "%s[%d]", path, i);
> db_find_key(hDB, hv_info->hKeyRoot, element, &hKey);

There is some confusion and inconsistency between db_xxx() functions,
some of them accept the array index "a[10]" syntax, some do not.

db_find_key() and db_watch()/db_open_record() do not operate on array elements
and do not accept the "a[10]" array index syntax.

K.O.