simplest and totally manual procedure to write inside config.json the encrypted passphrase, soon after fork, and then enable forging:

## install jq:
sudo apt-get install jq


## encrypt the passphrase:
1. install npm, n and lisk-commander (to encrypt your passphrase)


curl -sL  https://deb.nodesource.com/setup_8.x | sudo -E bash -
sudo apt-get install -y nodejs
sudo npm install -g n
sudo n 6.14.1
sudo apt-get install git
sudo npm install lisk-commander@v1.0.0-rc.0 -g
##then type
lisk "encrypt passphrase --output-public-key"


 ## then you will be prompted for
  Please enter your secret passphrase: ****
  Please re-enter your secret passphrase: ****
  Please enter your password: ****
  Please re-enter your password: ****

##In the first step, type in your passphrase and then type in the password you want to use for encryption.
##Afterwards you will get an encryptedPassphrase, publickey key value pair.
## you will have a JSON object output like this example:

{"encryptedPassphrase":"salt=67a33e926e7f530f63e82d3b8747c26e&cipherText=fceaabc2&iv=917ea94def16180160d06eb5&tag=9c28fda8afbd963c65cd9befedceeb6c&version=1","publicKey":"f350cbaa65b438a90082555c57f6347b6ee10b35c0bd5995b4cecd0b291989d8"}

### use this in all the following points when appropriate



2. launch lisk hq fork script

cd $home
rm lisk_bridge.sh
wget https://raw.githubusercontent.com/LiskHQ/lisk-scripts/development/downloaded/lisk_bridge.sh
screen bash lisk_bridge.sh -h 6901027 -n main




3. when fork is done, and lisk_bridge.sh ended, let's modify "config.json"
## as soon as fork script ends, and fork happened, launch the following:

cd $home/lisk-main
nano config.json

## Add this JSON object to your config.json under forging.delegates. like the following example:


"forging": {
  "force": false,
  "delegates": [{"encryptedPassphrase": "salt=67a33e926e7f530f63e82d3b8747c26e&cipherText=fceaabc2&iv=917ea94def16180160d06eb5&tag=9c28fda8afbd963c65cd9befedceeb6c&version=1",
                "publicKey": "f350cbaa65b438a90082555c57f6347b6ee10b35c0bd5995b4cecd0b291989d8"}],
    "access": {
            "whiteList": [
                "127.0.0.1"
           ]
        }
    },

## save and do a lisk reload
bash lisk.sh reload



4. let's enable forging

curl -H 'Content-Type: application/json' -X PUT -d '{"publicKey":"f350cbaa65b438a90082555c57f6347b6ee10b35c0bd5995b4cecd0b291989d8", "forging":true, "password":"your_password_used_at_point_1"}' http://127.0.0.1:8000/api/node/status/forging


## use 'history -c' and 'clear' at the end


That's all, folks!