Thoughts on hiring bikes on the Romantic Road between Würzburg and Füssen

We are rewriting our Romantic Road guide book at present to make it more compact and readable. Judith is rewriting the pages at the moment. When she is finished I'll play the editor and copy-edit. My job at the moment is the boring one: checking our appendices - accommodation, bicycle shops, bicycle hire etc.
I have noticed that more bike shops are renting bicycle and e-bicycles these days. However, and this is a big disadvantage, we have only found one shop offering a one way hire either from Würzburg to Füssen or vice versa. Considering that cyclists on the Berlin-Copenhagen Route can hire a bike at one end and drop it it off at the other, i.e. in two different countries with different currencies, it strikes me that it should be possible to cross one province: Bavaria with a set of bikes, picking them up at one end and dropping them off at the other. If you hire at one end and wish to take the bikes back, it's not that expensive to travel back to your start point by local train, but it takes at least six hours involving one or two changes.
There is one company that will allow you pick up a bike in Füssen (with pre-programmed GPS) and drop it off a week or so later in Würzburg. The Romantic Road cycle route is about 420km long and so a week would be a pleasant trip. The company is Radstation Allgäu, Abt Heß Straße 11, in the Multicycle store, D-87629 Füssen, Germany, T: 0049/0171/2056371,  info@radstationallgaeu.de, http://www.radstationallgaeu.de  (in German and Portuguese). A week's bike hire with bike pick up will cost you 179€ or a five day trip with four nights accommodation in middle class hotels for 599€. The company has a minibus and will pick you up after a week or so's cycling in Würzburg or somewhere before. How much this return trip costs is not clear. You could also just hire a bike or an e-bike for a week for between 55 and 120€, cycle to Augsburg or even Donauwörth and take the Via Claudia Augusta cycle route back to Füssen.