2 immediate thoughts,
1. as said above a bigger tractor will be far cheaper than a baler and wrapper and potentially cost neutral as mf 35s. Are very sought after, you might straight swap for a mf 165 with loader. Or an industrial like an mf20..with loader.
2. If your contractor is using a modern round baler they can actually be set to produce bales of any diameter, so get them made a bit smaller so your mf 35 can handle them. I think standard sizes are 4 or 5 ft diameter, what size do you currently get made...?
You could get them done say 3.5ft reducing weight considerably.
Ps see massey ferguson 30e. On ebay as an example.