dhcpcd-discuss

Hi,
is there a configuration option to stop dhcpcd installing IPv6 reject routes in the context of prefix delegation? In my use case I need to request a single /64 prefix from an upstream/delegating router, but I don't want to assign it to any interface because this traffic is handled by a snooping user daemon. Instead of the reject route I need to install a blackhole route, as the traffic gets handled so the Linux kernel must not send ICMPv6 unreachables.
Could this be done in a hook script instead: removing the dhcpcd-installed reject route and setting my blackhole route? Are there any conflicts to be expected, such as dhcpcd trying to reinstall its reject route?
Please note that the Linux kernel doesn't allow a higher priority blackhole route to be installed alongside the lower priority reject route -- at least that is what I see, but maybe I've missed something here and these two routes can be installed simultaneously??
With best regards,
Harald