Setting up legacy 802.11b AP with WEP on a Linksys WRT32X

I'm trying to setup an Access Point for a legacy hardware like my Compaq Armada E500 with Cisco AiroNet 350 wireless card or an iMac G3. The router I'm using is a Linksys WRT32X running OpenWrt 18.06.2. Unfortunately no matter which settings I use AiroNet 350 doesn't see the AP while other (modern) devices report it up and running on 802.11b, capable of 11Mbps, protected with WEP.

Does anyone have an idea what I might be doing wrong? Below is my configuaration taken from the '/etc/config/wireless' file.

config wifi-device 'radio1'
	option type 'mac80211'
	option channel '3'
	option hwmode '11b'
	option path 'soc/soc:pcie/pci0000:00/0000:00:02.0/0000:02:00.0'
	option disabled '0'
	list basic_rate '1000'
	list supported_rates '1000 2000 5500 11000'
	option country 'PL'
	option legacy_rates '1'

config wifi-iface 'legacy_radio1'
	option device 'radio1'
	option network 'legacy'
	option mode 'ap'
	option ssid 'Legacy'
	option wmm '0'
	option short_preamble '0'
	option encryption 'wep'
	option key '1'
	option key1 '26 hex digits here'
	option key2 'different 26 hex digits here'
	option key3 'even more 26 hex digits here'
	option key4 'and another set of 26 hex digits here'