Why limit 1000 bikes to superstock regs? The Junior is basically a 600 open so let the senior be a 1000 open. This removes the problem of policing it. I can see the argument of full on superbikes turning up but look at the TT lap times between the superbike and superstock and even short circuits are relatively close. A superbike is hard to ride and set up and you would still be on treaded tyres anyway.
You say the Junior/Senior isn't short of entries? I have to admit to not knowing the number of entries received by the club. Are we saying that only the newcomers is suffering a shortfall? Well as most n/c are on the modern jap stuff anyway then up the capacity limit and keep the race as well. Class A could be 1000 fours and 1200 twins Class B 750/600/250 smokers and Class C 125/400/650. The main classes for each would be boosted by a bigger newcomer race anyway.
I may sound like I have a 1000 bike in the shed waiting but this isn't the case. I just want the event to grow and prosper.
The more I think about this I'm afraid its probably just down to money. Tweaking the classes may help but long term it'll be peoples finances that determine who comes over. The entries are already subsidised and the IOMSP are going to justify their wedge somehow. The ACU won't drop a licence that fills the coffers (why can't the helicopter fund have the cash?) and every club has benefited in some way by extra entries from riders who need another finish.
I think we need race sponsors. Not for prize money but for start money for all.