Opinions On Dependency vs Duplicate Triggers vs Cross-Template Expressions

[Clontarf[X]]

Let me explain;

My customer has monitoring criteria of the following;
- Server not checked in to product in over 7 days
- Server is not a Windows XP machine
- Server has not responded to ping in last 24 hours

This translates to a Trigger which contains criteria like;

{Template - OS:system.localtime[utc].last()} - {$DEVICE_CHECKIN_EPOCH}>{$MISSING_CHECKIN_PERIOD} and
{Template - OS:wmi.get[root\cimv2,SELECT Caption FROM CIM_OperatingSystem].regexp(.*Windows XP.*)}=0 and
{Template - Ping:icmppingloss[{IPADDRESS},5,1000,,10000].last(86400)}=0

The problem as you can see is that I don't have a ping trigger in the same template, so of course this doesn't work.

In your opinions, is the correct thing to do;

1) Create a new trigger which is for the 24 hour period the customer specifies in my existing Ping template, then add dependency; or
2) Create a new trigger on Template - CheckIn which performs the 24 hour ping check and use that in my trigger; or
3) Lobby Zabbix to create the ability to use triggers from other templates/hosts in expressions.

Thanks