This was my objective, too, to not have to touch principal.
I retired nearly 9 years ago at 45. Part of my ER plan included splitting it into 2 parts. The first part was getting from age 45 to age ~60 intact, using only my non-retirement assets which represented about 2/3 of my portfolio. If at some point I had to dip into principal, that was okay as long as it wasn't a lot and wasn't until near the end of this 15-year period.
After I hit ~60, I would gain access to my "reinforcements." Those included (a) unfettered access to my rollover IRA, (b) my frozen company pension at age 65, and (c) Social Security as early as age 62, but something I wouldn't expect to need until age 65 or 67, the latter being FRA.
My longer-term retirement picture only gets better after age ~60 with those extra money sources. So, my main priority is getting to age ~60 intact. I'm 9 years into this 15-year timeframe and not only is everything well, but my SWR remains well below 3% (of all assets). And the principal has grown thanks to market gains since late 2008 when the market had tanked (and was a huge benefit to my ER BTW).
OP, you may want to split your ER plan into two parts if you have significant income sources becoming available in your 60s.