Headshell for RMG 309?

I was told that RMG309 should go with Ortofon SPU cartridges, but can Denon 103 work with Ortofon RMG 309? If it can, with which headshell?
I've found that Denon 103 is too light for SPU headshell. RMG 309 has a ocunter weight that can add up to 6g. The tonearm will balance at 32g headshell/cartridge. So, if the tracking force is 2g, the headshell/cartridge combined weight has to be at least 28g.
Even with heavy headshells like Orsonic av101 (16g), it would be very hard to find cartridges at 12g or more.

So, a 32g (28~33g) SPU cartridge would be a must for Ortofon RMG 309 arm for cartridges less than 12g. The only other choice would be to add a metal block (5~10g) on the headshell.

A quarter coin (5.67g) would be a good choice if the headshell has a big flat top.