This is already possible:
julia> oa = OffsetArray{Float64,2}(undef, 2:3, 2:3)
2×2 OffsetArray(::Matrix{Float64}, 2:3, 2:3) with eltype Float64 with indices 2:3×2:3:
8.80086e199 2.64131e233
2.58742e161 5.89012e-310
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