@Klingon thanks for the info - I don't have 1Gb/s+ internet (just 500Mb/s), so I'm not sure I'd be overly impacted by the DSA speed issue you linked (many thanks for the heads up!!). I have other reasons for migrating to 23.05.x so I may push forward with the upgrade regardless - I'm just intrigued about the "kernsize" change mentioned in the opening post (and ideally would like to hear it's worked for someone).
I helped debugging this in dec 22 on a MR8300. I've never tried on another device but I remember that the author of the patch runs it on a EA6350. The commands are easy and safe. Once done you can boot everything transparently. Flash a 23.05 factory and reconfigure from scratch.
EDIT : yes the author ran it on a EA6350v3 (read github thread).
I have ran snapshot/23.05 since january now, but I have reinstalled 22.03.5 lately as the device is about to get 1Gb fiber. I'll make several tests on 22.03 and 23.05 with the script given in the DSA thread.
Just a quick note.
If your ISP uses PPPoE for the wan connection the MR8300 is not powerful enough for a gigabit PPPoE connection even on stock firmware
In my testing, I could get around 300-400mbps with OpenWRT and around 700 to 800 on Linksys firmware.
I ended up sticking to the ISP-provided Mercku M6a which is based on OpenWRT and the MediaTek MT7621 and managed to gain access to Luci for my firewall tweaks and such.
This router gets 980Mbps
The bottom line is the MR8300 will not be fast enough for PPPoE(CPU can't keep up) even if and when hardware NAT is around, This will probably be the same for the EA6350 v3 as it has a similar CPU
I would recommend sticking to an ethernet-based wan connection by having a more powerful device act as the gateway and use the MR8300 or other device as the router as that way it is capable of full line speed gigabit on OpenWRT 22.03.05
PPPoE is what i hoped would be an issue but it turned out to be a very performance-intense protocol
As for the install process for OpenWRT linksys devices, it's pretty easy as they have dual partitioning so you are protected somewhat if you "soft brick the router" As long as you follow the device steps it should go smoothly.