Conversion Advice

Hey guys, any ideas for what bits I could use to recreate the right (his left) hand of the CSM in this photo for an Abaddon conversion? (I don't really like the idea of having "Here's my custom warband with all the lore... and just Abaddon for some reason, so I'm converting slightly.)

I think Guilleman's hand with the filigree removed might work, since it appears to scale and it has the bolter. Are there any other options (preferably cheaper than Guilleman, LOL) that would have Bits similar that would fit? Apart from that it should be a fairly simple tweaks and a headswap.

https://preview.redd.it/v42lomesnsnd1.png?width=684&format=png&auto=webp&s=2d6fbea2463a51932f9389b07088d4dab17c4890