Have you made any Roth contributions over the years? If so, you can withdraw contributions tax and penalty free, which would give you a bit more padding.
Only my wife has a Roth account and it only has $16,500 in contributions in it, $5,500 for 3 years. I'm not sure if we'll be contributing any more to it. $5,500 is still a decent part of $40,000 but it's not a huge amount, and I would only have that option for 3 of my 5 years. However, we could certainly say that a recession with a large drop in the market that hasn't recovered in 3 years would pose larger problems for the overall chances of the success of a 30 year retirement period.
My wife's Roth is 100% VTSAX though, so that would be affected by a large drop as well. I could certainly move that small amount of money to a bond heavy AA to have that money available. The combination of $5,500 from a Roth, scaling back expenses to 30k, and a part-time job would largely cover the risk that a big market drop poses to our taxable accounts, but I was trying to consider what other options would be available beyond scaling back spending and getting a job. Not that I'm above doing that, I just like to know what cards are on the table.