It looks to me that the package objects are being initialized properly already, unless I'm missing something. Please check the examples below and in the attached files.

Attached is a small test case that dynamically loads an SSDT which contains a package object which in turn contains references to other objects.


Main DSDT:
    Method (LD1)
    {
        Load (BUF1, HNDL)      // SSDT is in BUF1
        Store (HNDL, Debug)
        Return
    }   

Loaded table:
    External (DEV1, DeviceObj)
    Name (PKG1, Package() {
        1,2, DEV2, DEV1, 4})
    Device (DEV2) {}


AcpiExec Output:
- ev ld1
Evaluating \LD1
ACPI: Dynamic OEM Table Load:
ACPI: SSDT 0x00000000006DEEB8 000051 (v02 Intel  Load     00000001 INTL 20190509)
ACPI Exec: Table Event INSTALL, [SSDT] 006DEEB8
Table [SSDT: Load    ] (id 06) -    5 Objects with   1 Devices,   0 Regions,    1 Methods
ACPI Exec: Table Event LOAD, [SSDT] 006DEEB8
ACPI Debug:  Reference  [DdbHandle] Table Index 0x3
0x7 Outstanding allocations after evaluation of \LD1
Evaluation of \LD1 returned object 006D2FE8, external buffer length 18
  [Integer] = 0000000000000000

- ev pkg1
Evaluating \PKG1
Evaluation of \PKG1 returned object 006D2FE8, external buffer length 90
  [Package] Contains 5 Elements:
    [Integer] = 0000000000000001
    [Integer] = 0000000000000002
    [Object Reference] = 006DDF88 <Node>            Name DEV2 Device
    [Object Reference] = 006DD608 <Node>            Name DEV1 Device
    [Integer] = 0000000000000004