Well you could combine all 3 together, but it'll be harder to keep your stuff on Siege so skill items would be more of a problem to boost skills up. I try to not rely much on items even on production though, so you should be able to combine some of those skills into a Siege tamer.
Pet wise for example, you could use 2 kitsune and a mount with your bard tamer, and free up some points from taming and lore for use in barding skills. It's when you are aiming for max skills in barding and taming simultaneously that you'll run into problems. I rarely if ever used a greater dragon with my bard tamer, because they're slow and dumb and left her on foot
That's a pain if you fail a provoke and want to back away quick to invis and break target. In your case it's also a problem if someone attacks you and you're slower.
So to build your template, I'd suggest you start by deciding which is the highest skill requiring pet you absolutely need to control, then find whatever 99% control requires in skill points. That'll be your base. You could easily run that template with GM vet because you are also able to support your pet by provoking spawn round it and discording the tougher critters.
From there, my bard's magery was around 85 or so, whatever it takes to reliably cast invis. My bard carries a spellbook with +15 magery so she can grab that if she needs to rez or gate etc etc more reliably.
After that, the remainder is available for real skill in barding. I'd for 120 in music then whatever you can fit for the others. Perhaps a +5 boost option if you wanted 120 in either skill for hunts. Any remaining skill points can go into extra pet control or vet skill.
Alternatively you can easily fit magery and disco or provoke together, I just prefer to have my targeted disco with provo to work the spawn because then I can actually hunt and kill spawn alongside pets or totally without them.
Wenchy