As long as your guys are carrying chainaxes, include whatever you like!
Hmmm.... Easier said than done. In fact, I had avoided doing World Eaters precisely because of the chainaxe problem. Once I had committed I knew it was a problem that needed to be solved before I could get anywhere. Unfortunately, I didn't find much in the way of tutorials. After all, monkey see, monkey does. So in the interest of internet posterity i'll present how I went about tackling the problem of Chainaxes.
When Calth dropped my two buddies said,"Hey, you've still got your Marines from back in the day, right?" Why yes I did. It was truly a get the band back together moment. A few games later, some light credit card abuse, and I had some 60 or 70 Calth MK IVs. In addition, I had discovered the bitz sites, which, while not around in the late 90s/early aughts, I always knew was a good idea. I picked up right where I had left off and ordered a pile of MK VII CCWs, and specifically pistols.
Once I decided to do WEs (I'll miss you Templar Brethren!), I knew I need the axes. As with everything, it was a question of Time and/or Money and/or Quality. I could only have 2. I immediately discarded building them from scratch or messing around with 3D printing. That meant buying them. I bought a little from everyone for my first run.
Here are the Forge World ones. They are pretty stock and probably what most people think of when they think of Chainaxes, reasonably priced and available. I hear FW will bundle them with other WE bits if that's your jam. I think they might have some with the hands?
Anvil Industries definitely has them both with and without hands. They are not as detailed but a tad cheaper. Unfortunately they are also just in the one style.
Kromlech has some truly beautiful bits and the Chainaxes are no exception. A tad more expensive if only in that I wanted to reserve the double headed axes for Sgts.
The plan was to use all the pistol hands and pin the axes in. Just gluing them would probably be OK for the anvil industries axes due the better glue joint but nothing is worse than shoving 10 guys into a dog pile only to have an axe break off. Give it up, you'll never find it. Now stupid Bob is only wounding on 4s because he lost his axe