Is there any chance for mAP refresh supporting 5GHz, 802.1af/at and 1 Gig interface? It would be nice.

Not as small as map but maybe close enough ?
Add your own case and presto.

L11ug
https://mikrotik.com/product/l11ug_5haxd

Compared to mAP Lite, L11UG is gigantic.

L11UG is 105mm x 105mm, while mAP Lite is 48mm-ish x 48mm-ish.
You can fit 4 mAP Lites in the footprint of one L11UG

I doubt you can get 5GHz AX in size of map.