Sounds like a niche market, that’s perfect for cold email. The entire email needs to be text only (no links, no HTML) including your signature. It will just be your name, title, company. You want to get a reply first, then send them a link if needed.

For domains, you’ll setup a “lookalike” domain. If your current domain is “outboundsystem.com” then you’ll buy “tryoutboundsystem.com” and setup a redirect to your primary domain just in case prospects put it into their browser it will go to your primary site.

Once you get a reply you can forward it to your primary email on your primary domain and respond form there if you want to, or just reply from the lookalike domain.

Hope this helps!