Desktop Pro 2019 Discontinuation

I have a client on the 2019 version of QB Desktop Pro. The upgrade is not feasible for them due to Intuit moving to an annual subscription with their desktop product. This client is far from computer savy, so I am trying to avoid changing accounting softwares after investing so much time in training them on Quickbooks. The only feature they use that will be affected by the discontinuation is payroll. Can this client use QB Online strictly for payroll only and continue to use their desktop version for writing checks and reconciling? If so, can the payroll from QB Online be easily imported to the desktop version even after May 31, 2022?