Well I don't have much to say, these are called asset based mortgages. Instead of providing salary slips, you provide statements showing assets you own. In my case both were prepared to lend me 50% of valuations, at the same rate as everyone else. Eventually I didn't do anything as the amount I was able to cash out wasn't, in my mind, worth the additional complications for my wife if I pass away.
Several of my ex-colleagues picked up properties with these mortgages during the 2008 GFC, as they had lost their job.
I remortgaged a property with DBS in HK in May 2018 with employment based income. I had to provide a few months of bank statements, statements of our other mortgages, most recent company accounts and updated copies of HKID and address proof. Not very onerous at all. The loan was limited to 30% of the bank's valuation.
IIRC, it took about a month from application to draw down but I wasn't in any hurry and didn't press them to approve sooner.
Same interest rate and cash back as owner occupied mortgages.
Apologies, that should read "... with NO employment based income ...."