Using Roth contributions as part of bridge funds during the start of Roth Conversion Ladder

Ideally, I’m hoping to use a Roth conversion ladder in early retirement around the age of 50. I understand that you need 5 years of expenses saved up before you can touch the conversions.

Since I max by 401k & Roth contributions, I will likely hit my goal retirement number well before I will have 5 years of expenses saved up in a taxable brokerage account. I simply don’t make enough to be able to max my retirement contributions & save enough in my taxable on top of that.

I understand that Roth contributions can be withdrawn penalty-free. By the time I hit my goal retirement number, I’ll likely have about a year and a half of expenses in Roth contributions. Being able to supplement with these withdrawn contributions and decreasing the amount I need to save in my taxable brokerage by 30% would be a huge help.

Question is, is this generally a bad idea? Should I instead do everything I can to let that Roth money continue to grow tax-free for later on and just figure something else? Or is this something that’s viewed as being acceptable and not harmful down the line?