Expand Windows 10 Storage Spaces pool by replacing drives with larger ones

I have a two disk two-way mirror storage pool. It consists of two 2TB drives. It's at about 75% capacity and the drives are somewhat old. I'd like to replace the drives and expand the array. To be clear, what I want to do is end up with the same storage pool with two mirrored 4TB drives. The drives are internal in a tower desktop enclosure and I'd like to end up with the same arrangement. I've read this question and it seems on-point but it refers to a parity based pool.

The technique described would is:

1. Add one new 4T drive on USB and add to the pool.


2. Prepare one of the original 2T drives for removal.


3. Remove the 2T drive and replace it with the second 4T drive.


4. Prepare the other 2T drive for removal. All data should now be on the 4T drives.


5. Remove the second 2T drive and move the first 4T drive from USB to the internal SATA port.

The other question and the docs refer to preparing an existing drive for removal. On my computer, in the physical drive section of the Manage Storage Spaces there is no option for preparing the drive for removal, only "rename". Is it possible to use the described procedure in a mirror situation? Is there another way to accomplish what I want to do?

> PS C:\Users\Elton> Get-PhysicalDisk -FriendlyName PhysicalDisk1 | Get-VirtualDisk
PS C:\Users\Elton> Get-PhysicalDisk
DeviceId FriendlyName            SerialNumber         MediaType   CanPool OperationalStatus HealthStatus Usage       Si
                                                                                                                     ze
-------- ------------            ------------         ---------   ------- ----------------- ------------ -----       --
1        M4-CT256M4SSD1          00000000123709162E33 SSD         False   OK                Healthy      Auto-Select GB
2        Hitachi HDS5C3030BLE630 MCE9215Q0AS51W       HDD         False   OK                Healthy      Auto-Select TB
7        Seagate Backup+  Desk   NA7D0SNK             Unspecified False   OK                Healthy      Auto-Select TB
6        Seagate BUP Slim BL     NA7JAD6P             Unspecified False   OK                Healthy      Auto-Select TB
0        SanDisk SDSSDP128G      131060400181         SSD         False   OK                Healthy      Auto-Select GB
3        TOSHIBA DT01ACA200      23KMRZLAS            Unspecified False   OK                Healthy      Auto-Select TB
4        TOSHIBA DT01ACA200      23JJYEGYS            Unspecified False   OK                Healthy      Auto-Select TB