I'd be willing to do the same, but wonder if it does any good. Coffee grounds provide nitrogen, but tend to acidify the soil so save it for plants that flourish in acidic conditions.
Egg shells add calcium, plus a few trace minerals.
While I applaud your desire to participate in recycling, most people do not have enough houseplants to accommodate a daily dose of breakfast remains. Additionally, just throwing them on top leads to an unsightly mess and, eventually, those tiny, annoying bugs that are the bane of indoor plant owners. If you are planning to repot an acid-loving large plant, you might consider keeping a plastic bag in the freezer for your coffee grounds and finely crushed eggshells, mixing them into the new soil when you repot. Or use the thawed mixture in any flower beds you might have growing around your house. Frankly, this all seems like more planning, work and mess than a compost heap would be, so you might want to reconsider the options.