I do something a bit similar.
I have a 456 that I either run with 140mm vanilla and 26″ wheel or as a rigid 69r.
I would be springy in the summer rigid rest of year for lower maintenance and to add some edge to the south s tamer trails at winter speeds. About 30 minutes to do the swap including a swap of the brake caliper. Another brake would speed it up but my spare is too variable in working or not.
In brief I think I am saying it’s ok if you doo it one in a while or just like tinkering with bikes (that will be me)
Make sure you have a mess free head set that you can get spare crown races for.