What is the secure, self-hosted wallet to redeem BTG (Bitcoin Gold)? Hacking and being hacked is not cool



I'm looking for a decent solution to redeem BTG.

Ideally self-hosted and open source.

I have 12 words seed phrase, BIP39, deterministic derivation path, etc...

Related: Claiming my BTG from my BTC private key

They suggest using offline version of https://www.bitaddress.org/ to extrac the private key and then https://medium.com/@coinomi/collecting-your-free-bitcoin-gold-btg-coins-da937d4255d1



Relevant / irrelevant detail: after the snapshot took place, I've sent some BTC to another address. I believe I should still own the corresponding amount of BTG. 

For security reasons I'll first transfer my current BTC to a new SegWit address I'm holding, and only then start experimenting with BTG.



Related: BTG wallet or exchange with BIP39 seed import

Your recommendation with regards to BTG is greatly appreciated.

Research: https://play.google.com/store/apps/details?id=btg.org.freewallet.app


(surely it's not only me who has ponders this question)
Ideally self-hosted and open source.


State of the blockchain, crypto, whole ecosystem - early days - no ideal solutions - skilled developers are in extremely high demand and (to be honest) I didn't expect to find such tool.

With that said - first I moved actual BTC to another address.

Then - using the seed I was able to follow instructions here: https://coinsutra.com/claim-bitcoin-gold-btg/ (very good write up, THANKS)

In essence:


install Coinomi app (currently Android only)
restore wallet
put your phrase (don't tick BIP39)
add BTC (optionally, I first added BTC so that I could easily verify that balance is recognised)
add BTG - advanced - M/44H/0H/0H (important, defaults are not smart)
profit




I happened to keep BTC at blockchain.info (not anymore) so I had access to the 12 words seed - that was easy. There is a number of questions about claiming BTG from other type of the wallets - my first thought are leading towards bounty-smart-contract-fication - put some money in the pot and hire developers - so that whales can get their 5% dividend without risking much. 

In my case - I enjoy playing, educating, experimenting. It was time well spent - I believe so.