I do the same to make use of nind-denoise, too: exporting to a TIFF32, feed to nind-denoise, then import the denoised TIFF32 back into DT. Of course TIFF16 also works, but I found that highlight reconstruction data doesn’t transfer back to DT using TIFF16.
Be aware of color-related settings such as profile, intent, … The colors can be slightly off upon returning to DT, sometimes hard to detect.