What I want: https://mikrotik.com/product/crs354_48p_4s_2q_rm

What I can afford: a second hand 48 port switch and a bunch of PoE injectors

CRS354-48P-4S+2Q+RM | MikroTik

The 48 port champion you’ve been waiting for - now with PoE-out!

@txt_file replaced the switches at the #Nobreakspace with a second hand 52 ports switch and a 24 ports PoE switch - both with a #Realtek / #rtl83xx chip and OpenWrt support, 50€ each on kleinanzeigen.de. But yeah, 10 and even 40 Gbit/s ports and 750W for PoE on this Mikrotik one sound nice :D.
@T_X What are model numbers for proper switches with many (≥48) ports?
@txt_file for >= 48 ports + PoE: D-Link DGS-1210-52MP or ZyXEL GS1900-48HP.
I'm a bit confused though that I don't see the(se) PoE variants in the #OpenWrt Table of Hardware: https://toh.openwrt.org/?columns=VIRT_edit,brand,model,flashmb,switch,ethernet100mports,ethernet1gports,ethernet2_5gports,ethernet5gports,ethernet10gports,sfp_ports,sfp_plus_ports,vlan,commentsnetworkports
Also wouldn't recommend ZyXEL, as it only has 8 MiB of usable flash (16 MiB with A/B backup boot).
Also 52 ports with PoE seemed a bit more expensive and rare on kleinanzeigen.de, only saw that for ~150€ last time I checked.
HPE 1920-48G-PoE+ might also work. Search for rtl83(xx) in the ToH.
OpenWrt Table of Hardware - Device Compatibility Guide

Comprehensive list of devices compatible with OpenWrt firmware. Find the perfect hardware for your open-source networking project.