If I’m interpreting this correctly, that could be +10 to movement, have the 1d8 force damage APA gauntlet aaaaand the Infiltrator lightning launcher while not having disadvantage on stealth in heavy armor? 

Correct.  Though note that the force fists would not use your Intelligence to attack and would require Strength.  That shouldn't be a huge deal to a 14th level artificer capable of infusing the Belt of Hill Giant Strength, but at that point you're using two of your most powerful infusions to give you a backup 1d8 melee attack.  Unsure if worth, when Boots of Speed exist and can be infused much sooner to do the footspeed thing.