Well he doesn't seem to be nursing very much currently.
What you can do, is as you are doing...just nurse him IF he asks. Then, shorten the length of time you have him at the breast. When you/he are done...get up, pull down your shirt, stand up and busy yourself with something so he gets distracted.
Using Mom's boobies as a "playground" is normal and developmental, but it does not mean he will be "hard" to wean. Its something that they all do at certain ages.
Sure, you can try & pump and put your milk in a sippy cup... how he accepts it varies with each child. It's a major "transition" so it can take time. Does he take other liquids via sippy cup? If not, then it will be a learning thing for him to adjust to.
many babies/children will reject milk from a sippy cup, because it is not like Mommy... but they will take your milk or regular milk from a bottle... this is because they associate a "nipple" with where milk comes from... just like Mommy. It's just a natural instinct.
When he reaches 1 year old, then usually this is the time that milk is introduced... some take it no problem, others reject it. So be prepared for that. Or, some Moms combine milk and breast in varying ratios, gradually, until the proportions is all milk.
Once he is on whole milk, it can be out for up to 2 hours, before you have to dump it, and it will turn sour or be no good.
Some Moms, my friends, have actually put band-aids on their nipples to "wean" their child from breast. Thereby "explaining" to their child that "Mommy has a boo-boo...." Or, "Mommy's milk doesn't work..." But, at 1 years old, they may not yet be mature enough cognitively to fully understand what you mean fully.
If anything, just let him self-wean, since he is not really nursing very much anyway. Just make the frequency less and less... and then shorten how long he is at the breast. And then distract him. The bedtime nursing is usually the hardest to "end." Or, have Daddy do the bedtime routine with him... thereby substituting your breast nursings for something else. But is has to be consistent.
Also, perhaps let him have a "lovey" to bond with... this may help in the transition. My son, LOVES his stuffed cow to bits and sleeps with it.. and he "twiddles" its ears because it is like a "nipple" shape. This "twiddling" is instinctual as well.. and it is a self-soothing skill. Lots of children/babies will "twiddle" their stuffed animal loveys.
You seem to be decided about weaning... so now, it just takes patience.
All the best,
Susan