How would you solve: LUA "ifportup" checks with deterministic backupSelector value (fixed value)

[maltris]

I am testing out the LUA record type and came up with something like

A "view({ { {'10.1.0.0/16'}, ifportup(22, {{'172.16.0.1'}, {'172.16.0.2'}}, {failOnIncompleteCheck='true'}) }, { {'10.2.0.0/16'}, ifportup(22, {{'172.16.0.2'}, {'172.16.0.1'}}, {failOnIncompleteCheck='true'}) }, {{'0.0.0.0/0'}, ifportup(22, {{'172.16.0.1'}, {'172.16.0.2'}}, {failOnIncompleteCheck='true'}} })"

Which generally works. However, when the healthchecks have not been started yet, this leads to a SERVFAIL. If I set failOnINcompleteCheck to "false", I get the backupSelector default of "random". Which is not what I need. I also checked the other selectors such as all, hashed and pickclosest, but they are also not really what I need.

I would like to define a fixed value to be returned while the healthchecks are testing, like a all time working failsafe value.

10.1.0.0/16:
If 172.16.0.1 is up = Return 172.16.0.1
If 172.16.0.1 is down and 172.16.0.2 is up = Return 172.16.0.2
If 172.16.0.1 is down and 172.16.0.2 is down = Return 123.123.123.123

10.2.0.0/16:
If 172.16.0.2 is up = Return 172.16.0.2
If 172.16.0.2 is down and 172.16.0.1 is up = Return 172.16.0.1
If 172.16.0.2 is down and 172.16.0.1 is down = Return 123.123.123.123

0.0.0.0/0:
If 172.16.0.1 is up = Return 172.16.0.1
If 172.16.0.1 is down and 172.16.0.2 is up = Return 172.16.0.2
If 172.16.0.1 is down and 172.16.0.2 is down = Return 123.123.123.123

Best regards