If you want to buy a one-man push-around lift for on-stage, that's fine. If you additionally want to dig up a used straddle kit to hit your
house lights, that's also fine.
Buying enough scaffolding or a
boom lift to do this is going to be expensive and with scaffolding, the number of frames you would need would be extravagant and it would take up a lot of space somewhere when you aren't using it -- as well as being a PITA to move around the room. Your best bet is to either:
A) Replace your
house lighting with
LED fixtures and
wash your hands of touching these fixtures again anytime soon.
OR
B) Rent a
boom/snorkel lift every 12-18 months and
change every lamp whether they're burned out or not. Then all of your
house lights will burn out at roughly the same time so you wait 12-18 months until a handful have started to go, schedule another lift rental, and go to town. Compared to $75k for a
boom lift or several thousands dollars of scaffolding, a rental is a steal. See rates below for some generic rental place I just found online. You could do the entire room in a few hours and fall under the day rate plus whatever the delivery/pickup fees would be. (note, you would have to confirm a local lift company has such a lift in their rental
stock and that it has the horizontal reach at 30ft to get out over your seats from the
flat aisles as you may or may not be able to fit it down your aisles and use the lift on whatever slope your seating is raked at).
If you go this route, I would also knock your dimmers down to max out at 90-95% output and set up a timed event in your control
system for a warning flash at 2am with then lights out 5min later to make sure the lamps are getting turned off every night.
OR
C) Depending on what type of
house lights you have, buy a smaller scaffolding kit you may have uses for elsewhere and get up high enough that you can use a
pole designed for changing house lights to
grip the
bulb, twist it out, pull it down,
send up a new lamp, and twist it in. (note: this is the compromise of compromises and using light
bulb changer poles is...uhhhhh...an
acquired skill).