It looks like you should find another migration way.
From my side, I recommend you to pay attention to automated data migration service Data2CRM, an official HubSpot partner.
The service can help you to migrate the following modules automatically:
In case you need advanced migration features, the custom migration is available too.
It is important to notice that all the relations between records will be preserved.
You may try Data2CRM in action by running free Demo migration. That is, a limited part of your data will be imported into HubSpot and you will be able to see how it looks.
Otherwise, do not hesitate to contact Data2CRM experts and get more useful insights.
Hope it is a reasonable suggestion.