Yeah I get you. I think what @bevo said about having a utxos in varying sizes makes sense. I suppose consolation is probably more pertinent to those daily DCAs. I'm more of a lump sum every 2 weeks guy.  

 Unchained has an article that should help you. I found the first table under fee protection goes beyond dust section very usfull to decide on the UTXO size.

Hope this help.

https://unchained.com/blog/small-utxo-bitcoin-dust/