Use EoR but Remain an Internal Employee

First time poster, long time worker.

So I’ve been working at a British company for a few years now, I’m based in London, but can work from anywhere in the country. There isn’t any office space in the UK.

I want to move back home to Spain where my company doesn’t have a legal entity. I don’t want to be a contractor (B2B) because that makes me much more expendable, limits my career prospects within the company and the projects I can work on. So the plan I go to my manager and suggest a cost neutral approach where the total cost of employment stays the same but I get to pay the employer of record fees.

Have you managed to successfully use an EoR and still be considered an internal company employee? Get payrises, promotions etc? Is it easy for HR to let me keep the same email, accesses, SSO and workday profile and just change the entity that pays me? BTW I’m only considering remote dot Com as an Eor due to the IP protection they claim to offer.