Why don't you want to add the A record (and PTR record for that matter) to your DNS?

A properly working vSphere environment should have everything correctly registered in DNS to ensure proper running of your environment (even in a homelab). Aside from adding the hosts, you may experience unexpected results if components of your vSphere environment are not registered correctly in DNS. 

I'd say its easier to add these records than not add them for the extra grief it will cause you 

HTH