The interest rate on the 2nd is close to credit card rates, so it's not really worth it in my opinion. 

I have my credit cards under 10% always so there's that route as well to finance the emergency and use the funds for the next property. 

How about credit cards and friends?

As a side note, I always use credit card/travel hacking when doing this kind of spend, this last one basically bought be a free flight to Europe.

Also, syncing the bank feeds to your banks and credit card would be where you need to figure out.

Retention: Reward six months of on-time payments with a $10 card.

I built on credit cards mostly and with great tenacity, I  got a lender to finance a mortgage when most companies abruptly halted mortgage approval.During the crisis I took time off from building more.

Same for credit card etc only time you need different accounts is for different entities 

And have done at least 5 or 6 credit card loans up to 20k with 0% interest for a year to buy properties.

I don't think it's a get out of jail card.