Top one looks like an earth strap, lower one to the right looks like a tappet retainer bolt, Iirc these are lock wired in? they may have a copper washer underneath, so might just need nipping up.
Google Ingenium engine issues.
I don't think the ewoks are going to age well looks wise, but the same can be said for the full size rr/rrs.
As for keyless, just fit a switch in the starter trigger circuit.
Every 200 head gasket I have done has blown out the back of number 4 cylinder.
Every 300 head gasket I have done has been due to pressurisation of the cooling system.