Routing single local host internet traffic through remote IPSec tunnel gateway

Question

Hi to all, 
 I have one UTM 9 at HQ site and one UTM 9 at branch site with IPSec Active tunnel between them. 
 I would like, only for some specific hosts in HQ site, to present themselves on Internet using Branch site WAN IP address instead of HQ wan IP. 
 It is possible with some SNAT / routing rule? What would be the best way to address it? 
 
 thank you all

Marcello Reggiore · Answer

Just a quick update on how I work arounded finally the question. I created a RED tunnel and bridged a new interface in HQ UTM to it. Then I connected a little router WIFI to the bridged interface. When people from branch office come to HQ with their laptops, they connect to the bridged WiFi so they can continue to access internet presenting Branch Office WAN IP, mantaining their accesses on cloud resources. 
 A big thank to all, every ideas and suggestions came from this community