I think what I will do is, as some of you already mentioned1. reach out to some here who offered to help2. read the tax forum and find CPAs that I think has provided good guidelines and see whether I can get an initial consultation with themI know they can add value to my situation but unless I believe they can add long term value that will justify my payment, I'm not willing to commit to them. 

During Covid  other loan types got modification deals, not so much with VA loans.Department of Veterans Affairs is going to review every file with one late payment and check the deed, check the fire insurance.

He also states they don't have enough for the down payment (which he says he needs $230k for the downpayment).

If you have a small lawn to cut - you don't purchase a John Deere tractor - nor do you cut it with a machete.

@Alex ValenzuelaFocus on loan term if they don’t negotiateAmortize it over 30 years and your payment will be peanuts.

Would I assume liability for non payment?

These CPAs have their own companies and are taking a pay cut working with WealthAbility in the hopes of gaining wealthy well-vetted clients.

Should I at least offer to pay the down payment?

The best solution in your situation would be to get a non-owner occupied loan with no pre-payment penalties to buy the building then cashout refi in September when you move. 

The most important thing to consider would be that if you're using your HELOC for down payment / renovation costs and holding costs, then the refinance MUST get you all of your cash back to pay the HELOC back to 0.