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How do you mean by "technical shirts" ?
For overshirts I really like my swrve wool shirt + chore jacket but maybe a bit much when the temp is over 15 degrees, but pack really well and don't crease.
https://www.swrve.co.uk/collections/cordura-combat-wool-capsule-collectionThey also did a stretch short sleeve shirt but its hard to find (appears on ebay sometimes)
For summer I recently bought a nylon overshirt from amazon which is decent and xtremely lightweight/vented and looks pretty normal (no logo) though i find the sleeves are a little short on my size L (uk size M) (I'm a pretty average 5'10 but I can do pullups which sometimes takes up some sleeve space. )
https://www.amazon.co.uk/gp/product/B07429VPJ4/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
If you mean t-shirts that are technical but look smart-ish I doubt you could do better thane the dry x polos sumo mentioned.
Other possibility is ebay some Rohan. I quite like Rohan but last time I went into a shop one of the shop staff started asking me about my genetic background and whether I had any "mongolian ancestors" because she was "interested in racial heritage" so I've not been back since.
TBH 60k in a day rides where you don't want to wear lycra are my wheelhouse so I'd be interested in what people say!
Don't know where to better put this. Any "technical shirts" that I can wear on the bike for commuting (30k x2) as I want to look less "full on lycra"?