We do simultaneous closes on most of our wholesale deals, about two a month.
Talk to your title CO , if you explain to them what you want to do, they can best decide the methodology.
Be aware not all title companies will do them, but there are plenty that will.
Using and or assigns you could assign the contract, and you would not have a simultaneous close. Your 30k profit would show up on the hud, on the buyers side, as a "___fee" some buyers might not like to see that.
Simultaneous close would prevent that.
We use regular local mls purchase agreements, we close with that, no assignment. Then we have a separate contract with our buyer and close five minutes later. Our buyers close at the same sitting, but we may be a bit unusual there.
The deeds get recorded back to back.
We have had some title companies that wouldn't do it at all, one that would need 24 hour period in between. Some won't use buyers funds, others will.
Things are always a bit complicated until we work with people who make it easy.
I know that in Ohio an agent has to disclose to buyer and seller that he is an agent any time he is acting as a principal in a transaction
Obviously you need to make sure seller understands you are buying it as a principal and not representing him as an agent, at a minimum.
A call or email to your real estate attorney should get any other disclosure that may be required for your state.