Are Peecock products out of the running for you since you don't want an stp? Because I received mine a few days ago and it's great. They're not the most realistic thing on the market, but the gen2 looks good enough to more than deal with my dysphoria, and with the rod in it makes a great play device, especially with the pleasure kit!

They fit within your size limit, and you could always carefully remove the funnel if it causes problems for you. Just a thought.