Hi,
I don't think it is possible without buying agin some new licences. I had the same problem in the past as I needed to share the same dongle between my 'fixed' PC in my little 'home studio' in my basement and the portable one which is "travelling" by definition. I had to buy another USB dongle and a V-Collection licence (I bought previously the "10 years aniversary box". Hopefully sometime Arturia is doing some offers at reduced price...)
I recently bought the analog lab and which is a very nice piece of software but unfortunately I cannot use it on both machines unless I remember to move my dongle with me everytime... which is rather 'boring' (staying polite) sometime.
=> Therefore I am supporting your request to be able to use the software I paid for on at least 2 machines. I have the Pianoteq too, which as you said allows 3 licences, and the AAS lounge Lizard 4 & the sonicproject OP-X PRO II which are only protected by serials and it is just fine form me.
Being a software developer myslef, I fully understand Arturia has to protect their -huge- work by a dongle but they should consider at least a licence on two machines with the software you paid once. Thanks in advance for your understanding.
Cheers, Eric