Osmiroid copperplate nibs

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I'm searching for nibs and pens I can use for Spencerian and English rounhand. Dip pens can be nice, but aren't very portable. I was thinking of modifying a new affordable pen, but I know too little of nib standards, sizes and compatiblities. I found this add for Osmiroid copperplate nibs, and I guess they only fit some Osmiroid models, and can possibly be modified to go with other brands? Vintage is fun, but can end up involving a lot of fuzz, diy repairs and searching for parts.

On the other hand, I have already ordered a couple of vintage pens and are waiting for them to arrive any day now. They are rather randomly chosen, but have aimed for a bit of flex in the nib. I'm sure I will like them, but I have yet to try if they are up to Spencerian elaborations, the part where you press lightly on the nib for the down stroke.

How do you go about practicing a neat Spencerian script with a fountain pen these days?