Surfing through a range of online adaptive resources, I happened upon this clever fitting by Adapt2Row that goes on to any Concept 2E model to directly attach a wheelchair to a rowing machine. This simple adaptation reduces the requirement to procure a specialist erg seat (which can be expensive) and lets the athlete use their own wheelchair (often tailored in a number of ways to suit them in a custom fashion) for rowing. Also, it can be very helpful if transferring is a particular challenge for the athlete.
The fixed back on a wheelchair means that this device is most suited for PR1 (arms and shoulders) athletes.
Even if you don’t have Adapt2Row’s device, you can always detach the sliding rail of a Concept2 and position the main flywheel part in front of a wheelchair. It is a bit a faff and you might have to play around with a jury-rigged way to secure it in place (and the chair). But we have used this approach to provide access to an erg for patients at Stoke Mandeville in our taster sessions.