No, one doesnt need naphtha for clean up with d-limo teks, you can get pure white crystals if you have fumaric acid and later convert with slow water crystallization (check BLAB tek).
Also you can just reuse limonene, no need to throw it away.
Lastly, the mimosa/basified liquid is no problem just flushing down the toilet, after all, lye is normally used to unclog toilets. And if you still dont want to throw a basified liquid down the toilet, neutralize with vinegar or another acid. If you have a garden you can also neutralize with an acid and then burry it..
By the way, lye is not "super toxic", its just caustic. Dont let it touch your skin or eyes or something, and it should all be fine. Lye is used in the food industry often. Just like fire isnt toxic, but you shouldnt be putting your hands or eyes on it
In any case, follow your feelings... If you dont want to use lye, just do something like q21q21 or amor fati's tek, and then salt/convert the dmt fumarate as BLAB tek. Or if you cant get fumaric acid, just salt with vinegar and later convert to freebase and infuse herbs with the product like the other possibility in BLAB tek