Infantry Hybrid

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You should just go for tier 4 infantry. that is the best

Of course it's the best, but OP seems set on having a 3-3 hybrid. The introduction of hero classes should already scratch any hybrid-itch that players might have.

Pavise Champions are crossbowmen who have the shielding ability of commandos and the pew pew abilities of crossbowman. They lack only the two handed abilities of the commando. Legionnaires are essentially commandos + t3 pikeman (without the polearm abilities of a pikeman). There is even a shielding capable archer hero (it was probably the sentinel). They might not fit the exact specifications that OP wanted, but they are much better than a 3-3 hybrid because there isn't as large of a sacrifice in usefulness.