The zebra g/cheap modern pen variation works better if you change the feed - either to an ebonite one, or by increasing the size of the channels to help keep the flow up. But you're still stuck with having to change nib pretty often - sometimes in just hours (depending on the ink).
FNF and FPR have some decent modern flex options, or you could modify an nib on a noodler ahab or similar, but nothing's ever going to come close to either using a dip pen or vintage flex, which is increasingly hard to find as sellers have jumped on the concept and are over-flexing just about every nib made before the 70's and putting their prices up as a consequence. Many of these end up sprung and broken or useless, and it makes me wince to see some of them.
Even then, you still won't really replicate the XXF to BBBBB results you can get with a dip pen.
I can't be trusted with dip pens (I make far too much mess and an open ink bottle is a very bad idea for me!), so I keep looking, and my best results so far have been an FPR ultraflex and a heavily modified Ahab. Which is probably more than good enough for someone who's rubbish at calligraphy, especially flexi stuff, to start with - though I do have fun trying!
And welcome from me too
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