I finally decided to migrate to the Proton suite. Although it is a bit expensive for me so I need to shed as much cost as possible. As so, I was wondering if I could just purchase the VPN and Mail/Calendar together without having to pay for the Drive (as I already host a NAS myself) and the Pass (I use Keepass)
Yes. Don’t use Drive and Pass. I’m not being an a*hole: from memory, they did not lift the unlimited bundle’s price when they added drive and pass to it. For $1 more vs mail plus + VPN, you get more email addresses, custom domains, devices that can be on your VPN, split tunneling, etc. So you can look at Drive, Pass, etc as being free, which is a good thing because I’m not sure how many people would pay for them
Sorry I misread your post and thought you wanted pass. Personally I wasn’t impressed with VPN either. You can just sign up to 1 month of proton unlimited for around £12 and try everything. Then if after 1 week you decide to downgrade to mail plus only the remaining time you had goes towards your next purchase. So after 1 week you would have £9 credit towards a year of mail plus.