Is it actually doable to remove the Expense module and just use the Bills one for all instead?

Is it actually doable to remove the Expense module and just use the Bills one for all instead?

Expense module is lacking a lot of features that unfortunately are needed under my country regulations. I am thinking about just removing it and using the Bills one instead? Will I be missing something big or can it be perfectly managed?

For example I need for each bill to have 2 PDFs (once that will be the supplier bill but also another one generated on our company with some kind of tax receipt PDF.