There are many and numerous court cases that will reinforce this.  

If you're in an HOA there also may be regulation against having a short term. 

If you’re in a situation where you’re getting numerous showings, how do you keep those initial offers interested just in case the later offers don’t pan out.

No they did not but I've only put out numerous email inquiries;however, the answer from ALL has either been No or we don't do HELOC at all.Regarding your comment on the proposed solution, I'm not sure i follow.

Additionally, for rate-term refinances, many DSCR lenders have no seasoning requirements at all.Easier qualification: DSCR lenders have much lighter qualification requirements than conventional or portfolio lenders, such as no DTI, income verification, or tax return hurdles that can slow down or disqualify loansFlexibility: While conventional and bank lenders are heavily regulated and follow standardized rules, DSCR lenders have much more flexibility and control over their guidelines.

Most of the actual profits for title companies are generated by the title insurance policy itself, and in many a state, that cost is regulated by the state. 

There is regulation with it however, and I do think working with a custodian is a great way to ensure you are doing everything correctly. 

Are there current regulations or proposed regulations in place.

Having read extensively on the subject and listened to numerous podcasts, I'm excited to get started.

See if local regulations permits this first, then search on Vrbo and Airbnb to see if there are any sucessful properties in this area.