How to specify a default source address for outgoing traffic with netctl?

My machine has multiple static IP addresses on the ethernet interface, which are configured with netctl.

The configuration file of netctl looks like:

Description='A basic static ethernet connection'
Interface=ens0
Connection=ethernet
IP=static
Address=('6.6.200.5/32' '6.6.100.23/22')
Gateway='6.6.6.1'
DNS=('1.1.1.1')

I would like to make 6.6.200.5/32 the default source IP address for outgoing packets. But the route table always has 6.6.100.23/22 be the default. Then, I have to run

ip route change default via 6.6.6.1 src 6.6.200.5 dev ens0

manually to override it everytime after booting.

My question is: it is possible to specify the default source address in the configuration file of netctl?