Design to replace several jumper on a dense PCB
There are a number of factors that need to be considered here. Analogue circuits can be sensitive to routing things around just to make certain other features work. So the proposal of how to reduce jumpers has a lot to do with just how those jumpers are used.

A. If jumpers are used to simply isolate the circuit sections in the case a board is under debug trying to root cause a fault of some sort then it can be a good idea to simply use SMT components commonly called zero-ohm resistors to link the circuit sections. For the cases where an isolation is needed you simply remove the component with a tweezer type soldering iron.

B. If the jumpers are used for configuring the circuit so that it can be calibrated then it could be a great idea to use the analogue switches as long as the added component count and circuit complexity can be justified. There is a temptation with this approach to use multi-switch packages and the extra routing added to analogue signals could be a problem. Switches also add some capacitance and switch impedance that could become factors to consider in certain types of analogue RF or low signal level circuits.

C. If the jumpers are also used as test points to allow connecting scope probes and as signal injection points to apply signals from external testing gear then you really have no choice but to leave the jumpers in the design. You could consider using the smaller type of jumpers that have 2mm spacing or 50mil spacing.

It is possible that after you analyze your circuit that you will find that the current implementation is a mix of A, B, and C above and you can set to optimize each accordingly.