I’ve had a VPN at home for years using PPTP on a host running Windows 10. I’d like to setup another way to accept incoming connections but cannot find the best way to do it. The main issue is connecting with my phone that will only use the IKEv2 protocol, but I’m not seeing a way to setup a server using that protocol.
Replace your home router with something which supports OpenWRT. Setup OpenWRT to accept what ever VPN you want such as Wireguard, OpenVPN or L2TP/IPsec, etc.
That would be my advice. No need to keep your PC on for no reason. If you want access to your PC setup WoL.
Although yes he could install OpenWRT/PfSense or my favourite VyOS on his PC. A TP Link Archer C7 or something similar is no more than £40 here in the UK.
If OP is young and living with parents he could even argue he would save £40 in electricity after 2 - 3 months not running the PC 24/7.