What fountain pens can take FPR (fprevolutionusa) #5.5 Flex or Ultra Flex Nibs?

[Orange22]

Hi. I hope someone can help me with this because till now I was unable to find a solution on google or even youtube.

During the last year I bought about 10 different china pens. But he only one I feel comfortable writing with is the one on the photo. I think it’s a Pilot 78G copy and it fits perfect to my hand and the nib is also a bit flexible.

So what I need is a plastic/resin pen that can fit a #5.5 Flex or Ultra Flex FPR nib AND has a thin section. Similar to the one on the photo. I contacted FPR already and the recommended me to go with a “Indus” but to me the section of that pen looks too wide.

 

Thank you!!
 

[Orange22]

I still did not find a solution. Any help?