Well, as far as I know, Betfury has the option to transfer VIP status from another gambling platform to theirs. There is a link to a special form on the VIP club page.
Stake seems to have the same option, but for this, you need to contact their support and provide evidence confirming the presence of VIP status on another platform (screen with vip level, email confirmation, transaction (activity) history).
It is also worth noting that a few years ago, BCgame even had a special promotion allowing you to get a bonus for inviting friends who would transfer their VIP status from another platform to theirs. Now, on their VIP page, I did not see any information about transferring VIP status. Maybe it's not relevant anymore, but it's better to ask for their support.