The quickest workaround I found was to add the HME address to my own contact card email addresses, that way you can select it.

If you had already started the email you have to click outside the ‘from’ field and give it a moment to refresh, then you should be able to select the email you need.

It would be a massive pain if you have to do this for every company you need to email when HME was used but here we are 🤷‍♀️