I have been spending most of a day reading thread up and down and finally I found the solution, posted on page 5 on a thread by arnowong1112 (this one: https://hub.virtamate.com/threads/toyserialcontroller-vamlaunch.14653/page-5)
As pure copy/paste, here is the guide for connecting Kiiro Keon to Virt-A-Mate:
Step 1 Install Intiface Desktop : https://intiface.com/desktop/
Step 2 is to turn on the Bluetooth of the computer, then open Intiface Central, and click Start Server in the upper left corner.
Step 3 is to turn on your Kiiroo Keon, then click on the device in the left column of Intiface Central, you will see Start Scanning, click on it, and it will automatically start connecting to your Kiiroo Keon using Bluetooth.
Step 4, under normal circumstances, your Kiiroo Keon has been connected to Intiface Central, then you have succeeded 99%, click "Stop Scan".
IMPORTANT TO FOLLOW CAREFULLY:
Step 5, run VamSync from the start menu.
By default it uses embedded mode. Click Disconnect.
Close and restart VamSync.
Click "Intiface Desktop" at the top.
click connect
"Kiiroo Keon" will appear normally. Congratulations. You have linked VAM sync with Intiface and Kiiroo Keon.
Click Kiiroo Keon.
Also click Stop Scanning.
Step 6, open the game, use ToySerialController+VAMLaunch, start your wonderful journey!
This method is to use Intiface Central as a springboard to connect to VamSync!
Hope this can help other to a faster connection
As pure copy/paste, here is the guide for connecting Kiiro Keon to Virt-A-Mate:
Step 1 Install Intiface Desktop : https://intiface.com/desktop/
Step 2 is to turn on the Bluetooth of the computer, then open Intiface Central, and click Start Server in the upper left corner.
Step 3 is to turn on your Kiiroo Keon, then click on the device in the left column of Intiface Central, you will see Start Scanning, click on it, and it will automatically start connecting to your Kiiroo Keon using Bluetooth.
Step 4, under normal circumstances, your Kiiroo Keon has been connected to Intiface Central, then you have succeeded 99%, click "Stop Scan".
IMPORTANT TO FOLLOW CAREFULLY:
Step 5, run VamSync from the start menu.
By default it uses embedded mode. Click Disconnect.
Close and restart VamSync.
Click "Intiface Desktop" at the top.
click connect
"Kiiroo Keon" will appear normally. Congratulations. You have linked VAM sync with Intiface and Kiiroo Keon.
Click Kiiroo Keon.
Also click Stop Scanning.
Step 6, open the game, use ToySerialController+VAMLaunch, start your wonderful journey!
This method is to use Intiface Central as a springboard to connect to VamSync!
Hope this can help other to a faster connection