Switching from residential to buy-to-let

Hi everyone, I have a few questions about residential vs buy-to-let mortgages in the netherlands, and speficically around the transition between the two.

Let's say I buy a residential property in the netherlands with a loan of 100% loan to value.

Since I'm an expat, I may decide to leave after a few years, but would like to keep the property, which means I'd have to refinance to a buy-to-let mortgage as residential can't be rented out.

My questions are the following:

• What type of costs are associated with that?
• from what I see, buy-to-let mortgages generally require around 30% equity, but I've bought the residential on 100% financing. What happens in this case?
• Given the higher interest rates on buy-to-let, would the rental income be enough to cover the mortgage payment? Of course I know this depends on many factros, but what's the average scenario here?
• Is this generally recommended / something that people often do?

I know that these questions are somewhat hard to answer as things depend greatly on the bank, conditions of mortgage, etc etc. But I'd love to get some general feedback if any of you have done this in the past. Thanks so much in advance for your help.