Lots of flexibility too. 

@Herve FrancoisIf you're looking for additional flexibility on funds that are locked up in the Solo 401(K) account, a Roth conversion would allow you to access assets prior to 59.5. 

I love working with smaller banks/unions like this as they are a lot more flexible and they want to build lasting relationships as well!!

I find it those to be the cheapest, most flexible money available anywhere.

**Flexibility and mobility**The biggest argument in favor of renting over buying is the flexibility and mobility it offers.

If the plan does not allow for in-service distributions, you will have to wait until you leave that employer, the plan is terminated, or the plan is amended to allow greater flexibility.

My job is flexible and allows me the option of working remotely.

If you find properties with flexible cancellation policies, you can try requesting random open dates and start a message conversation with the hosts. 

This sounds like a great path to go down, especially if you enjoy doing it, you may find that you transition into doing the BRRRR strategy during it as well (if you find a property that would cash flow)If I were you, id go and sit with several community banks and credit unions to discuss what you need, they are often very flexible!

Conventional financing will be cheaper but if you don't qualify or need faster closing or otherwise want the flexibility of HMLs, then you will have a choice of such lenders.Contact a couple, briefly tell them what you had in mind.