Smart Groups for OS Upgrades

I think the best way is to create Smart Groups that have all the Model Identifiers you're looking for. Here is the list I used to create a group of Macs eligible for Mojave.

MacBookPro9,1
MacBookPro9,2
MacBookPro10,1
MacBookPro10,2
MacBookPro11,1
MacBookPro11,2
MacBookPro11,3
MacBookPro11,4
MacBookPro11,5
MacBookPro12,1
MacBookPro13,1
MacBookPro13,2
MacBookPro13,3
MacBookPro14,1
MacBookPro14,2
MacBookPro14,3
MacBookPro15,1
MacBookPro15,2

MacBookAir5,1
MacBookAir5,2
MacBookAir6,1
MacBookAir6,2
MacBookAir7,1
MacBookAir7,2

MacBook8,1
MacBook8,2
MacBook9,1
MacBook10,1

iMac13,1
iMac13,2
iMac13,3
iMac14,1
iMac14,2
iMac14,3
iMac14,4
iMac15,1
iMac15,2
iMac16,1
iMac16,2
iMac17,1
iMac18,1
iMac18,2
iMac18,3

iMacPro1,1

Macmini6,1
Macmini6,2
Macmini7,1

MacPro6,1

You could also use regular expressions to keep your Smart Groups more manageable.

Example for MacBookPro

^MacBookPro([9],d{1}|[1][0-5],d{1})$

Example for MacBook Air

^MacBookAir[5-7],d{1}$

In your Smart Group, choose Model Identifier match regex and put your regex string in.

macOS Mojave incompatible Mac Models - Smart Computer Group

This is what I am using currently for exclusion scoping