Adding a drive, and OS

Hello,

Current state:  Laptop with 1 TB encrypted drive running Ubuntu 16.04. 
(The first few lines from luksDump and the output from `lsblk`, `blkid`, 
and `df -h` is attached below.)

Would like a add a new 2 TB drive that is also encrypted and install 
20.04 on it. Would like to keep the 16.04 alive till I have used 20.04 
for a few months.

I came across these instructions: 
https://www.erianna.com/adding-an-secondary-encrypted-drive-with-lvm-to-ubuntu-linux/

Questions:

1) Would it be good to follow those instructions, especially given that 
I intend to install 20.04 on the new drive?

2) Or should I remove the 1 TB drive, add the new drive and install 
20.04 on it.  Then put both drives and boot -- and then do what to get 
an unified view of the two separately encrypted drives?

3) Or should I just add the new drive, boot from a 20.04 USB and install 
on the new drive, with the installation steps taking care of whatever 
would need to be done?  If so, what would be the options to select 
during the install?

Thanks.

sudo cryptsetup luksDump /dev/nvme0n1p3
   Version:      1
   Cipher name:  aes
   Cipher mode:  xts-plain64
   Hash spec:    sha256

sudo lsblk
     NAME                    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
     nvme0n1                 259:0    0 953.9G  0 disk
     ├─nvme0n1p3             259:3    0 952.9G  0 part
     │ └─nvme0n1p3_crypt     253:0    0 952.9G  0 crypt
     │   ├─ubuntu--vg-root   253:1    0 867.5G  0 lvm   /
     │   └─ubuntu--vg-swap_1 253:2    0  63.9G  0 lvm   [SWAP]
     ├─nvme0n1p1             259:1    0   512M  0 part  /boot/efi
     └─nvme0n1p2             259:2    0   488M  0 part  /boot

sudo blkid
     /dev/mapper/nvme0n1p3_crypt: UUID="xyz1" TYPE="LVM2_member"
     /dev/mapper/ubuntu--vg-root: UUID="xyz2" TYPE="ext4"
     /dev/nvme0n1p1: UUID="xyz3" TYPE="vfat" PARTLABEL="EFI System 
Partition" PARTUUID="xyz10"
     /dev/nvme0n1p2: UUID="xyz4" TYPE="ext2" PARTUUID="xyz8"
     /dev/nvme0n1p3: UUID="xyz5" TYPE="crypto_LUKS" PARTUUID="xyz9"
     /dev/mapper/ubuntu--vg-swap_1: UUID="xyz6" TYPE="swap"
     /dev/nvme0n1: PTUUID="xyz7" PTTYPE="gpt"

df -h
     Filesystem                   Size  Used Avail Use% Mounted on
     udev                          32G     0   32G   0% /dev
     tmpfs                        6.3G   58M  6.3G   1% /run
     /dev/mapper/ubuntu--vg-root  854G  659G  152G  82% /
     tmpfs                         32G  452M   31G   2% /dev/shm
     tmpfs                        5.0M  4.0K  5.0M   1% /run/lock
     tmpfs                         32G     0   32G   0% /sys/fs/cgroup
     /dev/nvme0n1p2               473M  136M  313M  31% /boot
     /dev/nvme0n1p1               511M   24M  488M   5% /boot/efi
     tmpfs                        6.3G  124K  6.3G   1% /run/user/11098



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