2004 BMW R1150RT - Rear main engine seal needs replacement

Very expensive labor cost for an inexpensive part makes dealer replacement not economically worthwhile. Ideal opportunity for an individual to do self-replacement or sell individual parts. Otherwise the bike is in functional, working order. Minor scratching on bodywork.
Color: Titan Gray Metallic
Mileage: Current 22,016 miles. Purchased in 2016 with 18,204 miles from original owner. Occasional use at a second residence in Madison, NH. Will bring to Brookline, MA, if necessary.
OEM Equipment: Electronically adjustable windshield; ABS brakes; heated grips; entertainment system removed to create additional storage.
Picture link https://photos.app.goo.gl/8avx173a8TyJR1h59