Any chance you can budget for more time? 12 days is tight, if doable, and only 2 acclimatization days is not enough for everyone. You also need to factor in an extra day or two in case getting in or out of Lukla airport is delayed by poor weather.
Personally, seeing as you are going all that way to a gobsmackingly beautiful region, I would budget for more time and spend as little of it on the main EBC route as possible. It’s over-run!
If you have time the Three Pass Loop (plus EBC as a side trip) is epic. I would certainly at least try to do Cho La Pass and come back down from EBC to Namche Bazaar via Gokyo
If you don’t have time for these options then Ama Dablam Base Camp is a great side trip on the way up to EBC and try to do Pangboche to Phortse on the way back down from EBC.
Also assume that everything will freeze inside your room some nights at elevation (the only heated area in the Tea Houses is usually the communal dining area). So, go prepared with an adequate sleeping bag and clothing layers.
Trail runners and micro spikes are totally fine for footwear.
Avoid fatty “western” food options (which raise blood lipids and “thicken” the blood) and alcohol (which dehydrates). Instead, drink plenty of water and Ginger Tea and otherwise eat like the locals do and be sure to have lots of garlic soup and chillies (this helps thin the blood and boosts cardiac output). Hydrate more than you think – at least 3.5 – 4L per day. It is very dry and dusty in the high Himalaya and AMS is at least partly associated with dehydration.
Make sure you educate yourself about AMS (and its variants).
Anyhow, whatever route you do or don’t have time for I’m sure you’ll have an amazing time – the Nepal Himalaya is like no other experience on earth!