I have a client who currently runs a venue and has ticket purchases made available through a third party. The way the site currently works is that there is a standard href in the nav menu to the ticket purchasing site.

<a href'http://example.com/events'>Events</a>
<a href'http://example.com/about'>About</a>
<a href'https://someticketvendor.com/myclient?blah'>Tickets</a>

They claim that they want to improve their SEO by appearing to integrate the ticket pages into their site. Having spoken to the ticket vendor, they only offer integration through iframes which is just horrible. I don't really know much about SEO but I'm wondering if I can create an htaccess rule to have http://example.com/tickets forward to href'https://someticketvendor.com/myclient?blah

Are they are any negative SEO implications to doing this? Is there a better way this could be done?