No true alarm panel will allow this. The alarm panel alone decides when an alarm condition occurs... The only external control is ARM/DISARM and zone bypass (when disarmed). You could achieve a similar effect with a Zwave or Zigbee siren... but that as external to the alarm panel. You could, if you can get the programming right, allow the HE to press a "panic" key to initiate an action.
The AlarmDecoder line of devices (The AD2USB/AD2PI/AD2SRIAL) are not directly compatible with HE. They require a middleman computer (IE: Raspberry Pi). On their own, they do not have any ability to do either DIY or professional monitoring... The Alarm Decoder can not be used for central station (professional) monitoring. The Alarm decoder devices work with DSC Power Series alarm panels and Honeywell Vista Plus series panels.
The Envisalink device is a stand alone network connected device. As such, it can interface directly with the HE for zone monitoring and control of alarm functions (Entirely local control). There is also a cloud based DIY monitoring service with arm/disarm control and basic SMS alerts at no additional cost. There is also a reasonably priced and totally optional addons for advanced alerts (~ CDN$60/yr) and professional central station monitoring service available (at ~ CDN$110/yr). The Alarm decoder devices work with DSC Power Series alarm panels and Honeywell Vista Plus series panels.
There are other alarm panels that are available... The newer "all-in-one" systems are definitely ones to stay away from... The tend to be (a lot) less automation friendly... (IE: Honeywell Lynx/Lyric, Qolsys, etc)... Also, the less popular alarm panels have far fewer options for connectivity and automation (GE Simon, Interlogix, Paradox, etc) and the options that are available are many times locked to a proprietary cloud system.
Also, beware the connectivity add-ons... The Vista Automation Module provides WiFi connectivity to the Honeywell Vista Plus series, but does not provide a usable API for automation... The various Honeywell Tuxedo Touch touchscreen control panels offer home automation capabilities (It has a built-in Z-Wave controller) but does not integrate with external automation systems (and provides VERY limited Z-Wave device compatibility). The GE Simon connectivity devices only integrate with the proprietary website...
Some alarm panels are designed with automation in mind or with an automation system built-in (ie: Elk M1, Elk M1Gold), but they tend to be no the more expensive side. They also tend to have a Serial or USB interface to automation systems, which would require an additional computer or a serial-to-network adapter and a custom driver for HE.
Generally, for inexpensive (or at least reasonably inexpensive) and easily expandible alarm panels, The DSC Power series and Honeywell Vista plus series are the most common and readily available. For Automation, the DSC has a slight advantage over the Honeywell (The DSC reports zone activity at all times, the Honeywell only reports zone activity on zones in a partition when it is disarmed). Both can be easily connected to the HE with an Envisalink module.
My personal opinion: With a DSC alarm panel and an Envisalink module, you will be able to have a solid, reliable and expandable alarm system with DIY monitoring and HE integration for automation control (and the envisalink driver will interface with HSM)... and if you need to have professional monitoring in the future, it is readily available.