A handful of hospitals now do an outpatient transperineal version of the transrectal biopsy. (This is not a template biopsy, which although also transperineal, is not an outpatient procedure.) However, it doesn't sound like it's very useful to know your gleason score, so probably no point.
Tamsulosin is a drug used to improve flow - you might ask if you can try it, or if it might be a problem with other conditions or drugs you're on. It's effect usually shows within 1-2 days, so you would know well within a week if it was going to be useful for you.
You mention slow flow and UTI. UTI's can be caused by failing to empty your bladder each time you pee, which allows any bacteria in the bladder to remain and build up again. If you aren't emptying your bladder every time, you should try practicing double voiding. This means after you peed, you wait half a minute or so, and then pee again. If necessary, keep doing this until you have emptied your bladder. It is often easier to do this if you sit to pee.