I think that is a brilliant idea. I just last year started using etch in 1/35, and I love the effect.
One suggestion? Measure the Warlord/Italeri BA armor before you resize. I don't have any yet, I'm curious if they are actually 1/56 or not.
At the price, I'm thinking of just buying my armor in 1/48. My resin 1/56 Churchill VII from Warlord was more expensive than the Tamiya 1/48 Jadgtiger I bought for DUST Tactics/Warfare. A lot of 1/48 Hobbyboss can be found on Amazon Prime.