Multiple Personal Onedrive Accounts In A Single User Account?

I recently purchased a six-user one year license to Office 365. Windows 10 only allows access to one personal OneDrive and one business OneDrive account in a given login.

Since I have licenses for six accounts (and only really need two personal ones), I want to use the remaining four by creating new emails (JohnsMusic@x.com, JohnsPictures@x.com, etc.) and assigning one of the remaining four licenses to each. This is the easy part. The hard part is I want to find reasonably priced software or a service that will allow each of the accounts to show as a seperate cloud drive while in my main user account.

My logic is I'm paying $99/year for a total of six user accounts with 1TB storage per account - continuing to pay for another cloud service backup for the total 3-4TB of files I have seems like a waste of money. Using the example above, I simply want to manually upload files by type (music, movies, pictures) to each sub-user and keep them as easily accessable cloud backups - all without having to jump between user accounts while working on the PC. The only one I want "auto-save" to run on is my main user account for documents.

Any ideas on the best service or software to accomplish this? Thanks in advance.