Now Customer Owned and Maintained Equipment (COME) has let the jeanie out of the bottle and there is no way to put the jeanie back in the bottle. I you have a business trunk line and a DID even over VOIP, setting your own line display name is a normal administrative task.
Sure, but the telco should still sanity check the ANI provided to make sure it's a number permitted over that PRI (or whatever you're calling with). IE: if you order a PRI with a 100 block of DIDs, the telco should reject any number that's not within your block of DIDs. If you want outbound calls to match your toll free, fine, but you should have to register that with the telco to permit it.