Tomoe River FP Notebook, 5.85" x 8.27", 368 pages (184-Sheet), Hard Cover, Dot Grid, White (TMR-A5NDW) https://www.amazon.com/dp/B079XXYWMZ/ref=cm_sw_r_cp_api_i_wQcyDb04S7P2T

They’re pretty pricey. But you can find other brands using very similar paper. They’re amazing with fountain pens so I’m sure it’d handle your pen well.