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this looks exactly what I'd envisaged when I was talking about installing a channel/runnel - thanks!
widening the hatch would probably have been an option but we've finished our reno now and so don't want to go down that route - besides, it's wood + tiles so it's already heavy enough as it is at 80cm square... which leads me on to my next question (probably for the home DIY thread) about installing (cheap!) hydraulic hinges to aid opening/closing
In Europe it’s pretty common to have one of those ramps in apartment buildings where bikes are stored in the communal basement.
See a variable length ramp here from a German site: https://ukib.de/Variabel-einstellbare-Fahrradrampe-E-Bike-Treppenrampe-von-60-365-cm-Laenge