Linux iptables/UFW - Exclude ONE host from nat

Question

Currently I am using UFW to NAT two IPv4 Subnets to VPN Interfaces like this:

extract of /etc/ufw/before.rules:

# NAT table rules
*nat
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -s 192.168.1.0/24 -o vpnif -j MASQUERADE
-A POSTROUTING -s 192.168.2.0/24 -o vpnif -j MASQUERADE

Now I was faced with a request to exclude a host (192.168.2.100) from this NAT towards VPN and let him use the "normal" external interface enp1s0.

I tried adding a rule before the two shown here, like this:

-A POSTROUTING -s 192.168.2.100/32 -o enp1s0 -j MASQUERADE

The rule seems to be added at the right position:

Chain POSTROUTING (policy ACCEPT)
num  target     prot opt source               destination         
1    MASQUERADE  all  --  192.168.2.100      anywhere            
2    MASQUERADE  all  --  192.168.1.0/24     anywhere            
3    MASQUERADE  all  --  192.168.2.0/24     anywhere      

But sadly traffic still exits via the VPN interface.... Can someone point me in the right direction here?

Thanks!