Hi, you have two options, both relatively easy, but one easier than the other, but both require a Diseqc switch or two.
Either get another
Sky dish, and install it for hotbird, then feed from both dishes into a Diseqc switch(es) and into the the Foxsat.
Or get a larger dish, say 80cm, align it to Hotbird and put a 2nd LNB on for 28E. The Triax TD78 with multiblock would be suitable for this, but there are other dishes to use as well.
The reason I say diseqc switch(es) is because the HDR is a twin tuner and you may want to have both tuners switchable between satellites if the software allows.
I'm pretty sure that Diseqc switching is posible using the HDR, but you have to go into a secret menu for multisat, using red, green,yellow, blue, red, green, yellow, had one working OK on a motor.