Yep that skipping cursor machine will drive you batty, or too drinking too heavily.
STILL say try a remote keyboard and mouse and use it "hands-off" as just a base unit.
Just had the first of season ruhbarb cobbler. Yum. Yum.
Jeff an alternative to inverters search up RediLine DC to AC rotary converters (motor/genrator). Manufactured 1980's to current. Used a lot as work basket tools power suppliers on self-travel manlifts. The 1600 watt versions are readily available used E-Bay. These are copper winding's and laminated iron balls deep for motor starting and have nice clean output for any electronics. On my old DOW photo album I showed my collection of three 1600 watt'ers, two 550 watt'ers and my old heavy as sin Trace 2.5kw modest frequency/heavy transformer full-sine inverter/multi-source charger.