What model TV are you using it with? The model number please, not just the name. For TV remotes, you often need to go to the manufacturer if the basic remotes that Roku sells aren't what you're looking for.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.
That model isn't sold separately, I know it is the remote included with Stick+ 3811 that is a Best Buy exclusive. If you want a headphone jack remote the RC-AL9 will do everything your remote does but adds two programmable keys marked 1 & 2 that will hold a voice search prompts. But it is on backorder to the end of the month at least. I ordered one Aug 3 with shipping date of Sept 1, which has been change to Sept 14, who knows if it will change again?