I had the same problems. Could use proxychains with vip72 app but just using iceweasel, not TOR
But at the end iceweasel on the workstation will go through TOR. I know I am not protected as using TOR but for me it’s ok.
Did you figure out how to use TOR and VIP72 on whonix?
I found also that proxychains is extremely slow.
I tried on iceweasel to change the network settings and inside iceweasel I just used vip72 ports, id est
127.0.0.1 port 9951.
I think that with this configuration is just using proxychains. I will have this configuration:
TOR on gateway > iceweasel on Workstation > socks5
is it correct?
this is 10 times faster compared to proxychains method