Since Bulwark doesn't appear in Maintained, it can't be monitored in the Maintained Spell Monitor. But you can set up an announcement whenever you cast it, using the Icon Bar:
The setup shown above announces into gsay, but you can change that to raidsay if you prefer.
The "lite" Maintained Spell Monitor window has a smaller feature set than the standard version which includes the followup spell button. You can choose between lite and standard when you check for updates with the utility (gear icon). The followup button would not apply in your case since Bulwark of Order is not maintained.