Something like:
static (inside,outside) 7.5.210.0 access-list policy-nat
access-list policy-nat permit ip 10.240.1.0 255.255.255.248 205.100.150.0 255.255.255.0
access-list policy-nat permit ip 10.240.1.0 255.255.255.248 140.175.200.0 255.255.255.0
Then reference the policy NAT subnet in your crypto access-list
access-list cryptoACL permit ip 7.5.210.0 255.255.255.248 205.100.150.0 255.255.255.0
access-list cryptoACL permit ip 7.5.210.0 255.255.255.248 140.175.200.0 255.255.255.0
I know you wanted to just use 4 addresses but summarizing them in to a /29 is much easier than having individual policy NAT configurations. Just make sure that static is placed above any existing statics that may use the same internal addresses.