Pompino rear mudguard fitting

I'm fitting a rear mudguard to my Pompino frame. It doesn't have a hole for fitting a rear brake so I need to figure something else out. I have another bike with a similar setup where I drilled holes and used zip ties - but this won't work as the frame design isn't flush with the mudguard. In the past I have drilled through the mudguard and bolted it straight to the frame, but I would prefer a more elegant solution. Any suggestions?

Do you have a picture of the rear bridge/wishbone underside?

Where the frame points at the tyre there's a hole that you can fit a bolt to.

Where the frame points at the tyre there's a hole that you can fit a bolt to.

^ Thats exactly what I was getting at. With frames without a brake hole, there is usually a bolt on the underside of the bridge.

Whats the issue here then? Just bolt straight through, or use some kind of L-bracket to make a virtual hole in the usual place.

In the past I have drilled through the mudguard and bolted it straight to the frame, but I would prefer a more elegant solution. Any suggestions?

This?

I have a feeling that the bottom of the single stay (where it forks) has a threaded hole in the end. Can't remember for sure though.