Two really easy methods I’ve found for bleeding motorcycle brakes:
First is a cheap hand vacuum bleeder from harbor freight. These things don’t like to be used more than once if stored for a while, so basically one time use. Works great though. I’d start with this option as it comes with all the bits you’ll need.
Second is to reverse bleed using a big syringe. This works great for pushing cumbersome air pockets up instead of forcing them down. You’ll need to get some clear pvc hose from Home Depot or wherever, attach to syringe with a hose clamp, and place the other end of the hose onto the bleeder valve on the caliper(s). Do this with an empty reservoir so it doesn’t go flying everywhere.
https://www.amazon.com/dp/B07R19HW1H/ref=cm_sw_r_cp_api_glt_fabc_JYTKVNAA1YFHW5FYGTSR
I run pods on the carbs with the battery where the airbox usually is. no problems. It's not hot there. You'll need to deal with the crank case vent too. that usually goes down the right carb. I put a little breather on it. It's actually nice not having the blow-by in one carb, easier to balance
Side note - be very careful trying to get the old adhesive off. These tanks are decaying from the inside due to ethanol, usually.
Seal-All 380112 Contact Adhesive and Sealant - 2 fl oz https://www.amazon.com/dp/B008VK0JS4/ref=cm_sw_r_cp_api_glt_fabc_G7D8PD8BKREW4SJP5PEG?_encoding=UTF8&psc=1
I’ve always used Seal-All on my R75/5.
Another tip is to keep the tank totally full so that there is no room for moisture to be absorbed by the ethanol/gasoline.
By the way, is that the original paint? Looks like Poppy Red. I have a Granada Red ‘73!
Adding to the oil comment, what's even more critical than getting the engine oil right (I use conventional Pennzoil High Mileage 10W-40) is getting the transmission and rear end oil correct. There are bronze bushings in both units that will chemically erode if GL5 gear lube is used. Buffered lube is inadequate as well. Only ever use GL4 or lower transmission oil, as it is fully compatible with yellow metals. NAPA usually stocks Sta-Lube GL4 85W-90 transmission oil in gallon jugs. One jug will get you several seasons of oil changes.