I'm sure this has been suggested (and protest against this ownership in any form is welcomed), but Venkys are impervious given the geographical distance/bunker mentality. What I do think would hurt them is a targeted campaign in India: billboards/advertising in Pune, banners at IPL games, asking Liam Livingstone to speak out in India (not sure how RCB Challengers would feel about that one).
And any attention, a simple message from the fanbase: 1. Steve Waggott goes 2. Suhail goes 3. Venkys fund the club, or sell at the first available opportunity.
Clearly they don't care about their reputation in the UK, but I'd be certain they will there. A big ask and would take time, planning and significant resources, but if someone like WATR were to crowdfund for a campaign like that, there'd be no shortage of Rovers fans (I for one) who'd want to be involved.