Can the iMac27, Mid 2011, monitor be used with a Raspberry Pi 400? I need a monitor.

I bought a Raspberry Pi 400 because my Insteon Hub 2245-222 went inoperable when Insteon closed up shop but it is back in operation and I have the green light on the Hub and it is working.

In my previous home that was a custom build I purchased a moderate number of devices and I installed everything because my original GC thought that a SmartHome was having an intercom/door bell system. He couldn't understand how I could control my thermostat, lights, irrigation and more with an App. Instead of arguing more on the subject and his wanting to wire the house for 3-way and 4-way switches and I said NO, I just fired him and the Master Electrician in the middle of construction and hired new people that UNDERSTOOD what a Smart Home could do. At the end I had 69 operable devices throughout my home and used a software called Indigo to control everything.

I sold the house and moved back to Florida and bought a new home that had 5-6 Lutron Caseta devices installed. But because Insteon devices could offer so much more than any other system and it was so much cheaper than Control4 or similar systems and because I had on hand 15-20 Insteon Devices on hand that I had purchased in my New home I wanted to use the Insteon System. Earlier this year I purchased the Insteon Hub earlier this year (2022) and I thought I would some how integrate a system that would allow both Insteon and my Lutron devices to work side by side.

Then disaster hit and the Hub became inoperable (no Green Light). Both my wife and I are disabled with limited physical movement so getting the home automated was at the top of the list. I found a company called Home Assistant that had open-source Shareware software that was free and they had users available who used the software 100% of the time. This software could run on almost anything but I don't leave my iMac 27, Mid 2011 on 100% of the time any more so I needed a simple cheap computer that I could install my Home Assistant (HA) on and there were also quite a few Insteon users and they had created software that ran on the HA software, but the computer had to run 24/7 and they suggested the Raspberry line of products. Then recently the Insteon company, which was now in receivership was purchased and the servers were turned back on and walla walla hocus pocus we are back in operation. When the Insteon Servers came back on-line and the green light is on I began testing the pile of Insteon Devices to be sure they work. So far I have 5 devices operational and I need to figure out how the Raspberry work with HA.

The Raspberry Pi 400 is a Keyboard with the computer inside. Not new, but it works. It's kinda like my 2nd computer, a Commodore 64. First was a Timex TS-1000. No internal HD or monitor either. It has its OS on a SD Card along with the HA software. If there is a power outage the SD card will allow the Pi 400 to restart and run the HA software.

I am in need of a small monitor for my new high tech Raspberry Pi 400! I was planning on using my iMac 27's screen but tonight I found out that it won't work with anything other than an Apple Computer. Any suggestions for a monitor?

Here's a link to Raspberry: https://www.raspberrypi.com/for-home/

And here's a link to Home Assistant: https://www.home-assistant.io/

Any ideas on using my iMac's monitor with my Raspberry would really be appreciative.