Okay you Roth experts out there, I Googled around a bit, but couldn't find anything on this: next year, I will retire, but will maintain a part-time hobby side gig, so I will be earning money and thus eligible to contribute to a Roth (and indeed, we should fall below the income threshold for direct contributions; the past few years, I've to do backdoor conversions because we exceeded the limits).
My question is this -- is there any reason I can't contribute directly to my Roth AND do Roth conversions from my 401k*?
* I'm actually in the Fed TSP, so I plan to do a partial rollover of funds to a tIRA, then do conversions from there.